diff --git a/api/multiplayer.php b/api/multiplayer.php
new file mode 100644
index 0000000..10f26d0
--- /dev/null
+++ b/api/multiplayer.php
@@ -0,0 +1,493 @@
+<?php
+declare(strict_types=1);
+
+header('Content-Type: application/json');
+
+require_once __DIR__ . '/../db/config.php';
+require_once __DIR__ . '/../db/migrate.php';
+
+run_migrations();
+cleanupMultiplayerState();
+
+try {
+    $payload = getRequestPayload();
+    $action = strtolower((string) ($payload['action'] ?? $_GET['action'] ?? ''));
+
+    if ($action === '') {
+        jsonResponse(['success' => false, 'error' => 'Missing action.'], 400);
+    }
+
+    switch ($action) {
+        case 'create_room':
+            ensurePostRequest();
+            createRoom($payload);
+            break;
+
+        case 'join_room':
+            ensurePostRequest();
+            joinRoom($payload);
+            break;
+
+        case 'update_state':
+            ensurePostRequest();
+            updatePlayerState($payload);
+            break;
+
+        case 'get_state':
+            getRoomState($payload);
+            break;
+
+        case 'leave_room':
+            ensurePostRequest();
+            leaveRoom($payload);
+            break;
+
+        default:
+            jsonResponse(['success' => false, 'error' => 'Unsupported action.'], 400);
+    }
+} catch (Throwable $exception) {
+    error_log('Multiplayer API error: ' . $exception->getMessage());
+    jsonResponse(['success' => false, 'error' => 'Internal server error.'], 500);
+}
+
+function getRequestPayload(): array
+{
+    $rawBody = file_get_contents('php://input');
+    $jsonBody = json_decode($rawBody ?: '', true);
+
+    if (is_array($jsonBody)) {
+        return $jsonBody;
+    }
+
+    if (!empty($_POST)) {
+        return $_POST;
+    }
+
+    return $_GET;
+}
+
+function ensurePostRequest(): void
+{
+    if (($_SERVER['REQUEST_METHOD'] ?? 'GET') !== 'POST') {
+        jsonResponse(['success' => false, 'error' => 'POST required.'], 405);
+    }
+}
+
+function jsonResponse(array $payload, int $statusCode = 200): void
+{
+    http_response_code($statusCode);
+    echo json_encode($payload, JSON_UNESCAPED_SLASHES);
+    exit;
+}
+
+function normalizeDisplayName(?string $displayName, int $slot = 0): string
+{
+    $name = trim((string) $displayName);
+    $name = preg_replace('/\s+/', ' ', $name ?? '') ?? '';
+
+    if ($name === '') {
+        return $slot > 0 ? 'Player ' . $slot : 'Player';
+    }
+
+    $name = function_exists('mb_substr') ? mb_substr($name, 0, 48) : substr($name, 0, 48);
+    $name = strip_tags($name);
+    return trim($name) !== '' ? $name : ($slot > 0 ? 'Player ' . $slot : 'Player');
+}
+
+function normalizeRoomCode(?string $roomCode): string
+{
+    return strtoupper(preg_replace('/[^A-Z0-9]/', '', (string) $roomCode) ?? '');
+}
+
+function generateRoomCode(PDO $pdo): string
+{
+    $alphabet = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789';
+    $checkStmt = $pdo->prepare('SELECT 1 FROM tetris_rooms WHERE room_code = :room_code LIMIT 1');
+
+    for ($attempt = 0; $attempt < 12; $attempt++) {
+        $code = '';
+        for ($i = 0; $i < 6; $i++) {
+            $code .= $alphabet[random_int(0, strlen($alphabet) - 1)];
+        }
+
+        $checkStmt->bindValue(':room_code', $code, PDO::PARAM_STR);
+        $checkStmt->execute();
+        if (!$checkStmt->fetchColumn()) {
+            return $code;
+        }
+    }
+
+    throw new RuntimeException('Could not allocate a unique room code.');
+}
+
+function generatePlayerToken(): string
+{
+    return bin2hex(random_bytes(24));
+}
+
+function cleanupMultiplayerState(): void
+{
+    $pdo = db();
+    $pdo->exec("UPDATE tetris_room_players SET connection_status = 'disconnected' WHERE last_seen_at < (UTC_TIMESTAMP() - INTERVAL 2 MINUTE)");
+    $pdo->exec("UPDATE tetris_rooms SET status = 'closed' WHERE updated_at < (UTC_TIMESTAMP() - INTERVAL 12 HOUR)");
+}
+
+function createRoom(array $payload): void
+{
+    $pdo = db();
+    $roomCode = generateRoomCode($pdo);
+    $playerToken = generatePlayerToken();
+    $displayName = normalizeDisplayName((string) ($payload['display_name'] ?? ''), 1);
+
+    $pdo->beginTransaction();
+
+    try {
+        $insertRoom = $pdo->prepare('INSERT INTO tetris_rooms (room_code, status, expires_at) VALUES (:room_code, :status, (UTC_TIMESTAMP() + INTERVAL 12 HOUR))');
+        $insertRoom->bindValue(':room_code', $roomCode, PDO::PARAM_STR);
+        $insertRoom->bindValue(':status', 'waiting', PDO::PARAM_STR);
+        $insertRoom->execute();
+
+        $roomId = (int) $pdo->lastInsertId();
+
+        $insertPlayer = $pdo->prepare(
+            'INSERT INTO tetris_room_players (room_id, player_token, player_slot, display_name, connection_status, game_status, last_seen_at) '
+            . 'VALUES (:room_id, :player_token, :player_slot, :display_name, :connection_status, :game_status, UTC_TIMESTAMP())'
+        );
+        $insertPlayer->bindValue(':room_id', $roomId, PDO::PARAM_INT);
+        $insertPlayer->bindValue(':player_token', $playerToken, PDO::PARAM_STR);
+        $insertPlayer->bindValue(':player_slot', 1, PDO::PARAM_INT);
+        $insertPlayer->bindValue(':display_name', $displayName, PDO::PARAM_STR);
+        $insertPlayer->bindValue(':connection_status', 'connected', PDO::PARAM_STR);
+        $insertPlayer->bindValue(':game_status', 'ready', PDO::PARAM_STR);
+        $insertPlayer->execute();
+
+        $playerId = (int) $pdo->lastInsertId();
+
+        $updateRoom = $pdo->prepare('UPDATE tetris_rooms SET host_player_id = :host_player_id WHERE id = :room_id');
+        $updateRoom->bindValue(':host_player_id', $playerId, PDO::PARAM_INT);
+        $updateRoom->bindValue(':room_id', $roomId, PDO::PARAM_INT);
+        $updateRoom->execute();
+
+        $pdo->commit();
+    } catch (Throwable $exception) {
+        if ($pdo->inTransaction()) {
+            $pdo->rollBack();
+        }
+        throw $exception;
+    }
+
+    jsonResponse([
+        'success' => true,
+        'room' => [
+            'code' => $roomCode,
+            'status' => 'waiting',
+            'player_count' => 1,
+        ],
+        'self' => [
+            'token' => $playerToken,
+            'slot' => 1,
+            'display_name' => $displayName,
+        ],
+    ]);
+}
+
+function joinRoom(array $payload): void
+{
+    $roomCode = normalizeRoomCode((string) ($payload['room_code'] ?? ''));
+    if ($roomCode === '') {
+        jsonResponse(['success' => false, 'error' => 'Room code is required.'], 422);
+    }
+
+    $pdo = db();
+    $pdo->beginTransaction();
+
+    try {
+        $roomStmt = $pdo->prepare('SELECT * FROM tetris_rooms WHERE room_code = :room_code LIMIT 1 FOR UPDATE');
+        $roomStmt->bindValue(':room_code', $roomCode, PDO::PARAM_STR);
+        $roomStmt->execute();
+        $room = $roomStmt->fetch();
+
+        if (!$room || $room['status'] === 'closed') {
+            if ($pdo->inTransaction()) {
+                $pdo->rollBack();
+            }
+            jsonResponse(['success' => false, 'error' => 'Room not found.'], 404);
+        }
+
+        $countStmt = $pdo->prepare('SELECT COUNT(*) FROM tetris_room_players WHERE room_id = :room_id');
+        $countStmt->bindValue(':room_id', (int) $room['id'], PDO::PARAM_INT);
+        $countStmt->execute();
+        $playerCount = (int) $countStmt->fetchColumn();
+
+        if ($playerCount >= 2) {
+            if ($pdo->inTransaction()) {
+                $pdo->rollBack();
+            }
+            jsonResponse(['success' => false, 'error' => 'Room is full.'], 409);
+        }
+
+        $playerToken = generatePlayerToken();
+        $displayName = normalizeDisplayName((string) ($payload['display_name'] ?? ''), 2);
+
+        $insertPlayer = $pdo->prepare(
+            'INSERT INTO tetris_room_players (room_id, player_token, player_slot, display_name, connection_status, game_status, last_seen_at) '
+            . 'VALUES (:room_id, :player_token, :player_slot, :display_name, :connection_status, :game_status, UTC_TIMESTAMP())'
+        );
+        $insertPlayer->bindValue(':room_id', (int) $room['id'], PDO::PARAM_INT);
+        $insertPlayer->bindValue(':player_token', $playerToken, PDO::PARAM_STR);
+        $insertPlayer->bindValue(':player_slot', 2, PDO::PARAM_INT);
+        $insertPlayer->bindValue(':display_name', $displayName, PDO::PARAM_STR);
+        $insertPlayer->bindValue(':connection_status', 'connected', PDO::PARAM_STR);
+        $insertPlayer->bindValue(':game_status', 'ready', PDO::PARAM_STR);
+        $insertPlayer->execute();
+
+        $updateRoom = $pdo->prepare('UPDATE tetris_rooms SET status = :status, expires_at = (UTC_TIMESTAMP() + INTERVAL 12 HOUR) WHERE id = :room_id');
+        $updateRoom->bindValue(':status', 'active', PDO::PARAM_STR);
+        $updateRoom->bindValue(':room_id', (int) $room['id'], PDO::PARAM_INT);
+        $updateRoom->execute();
+
+        $pdo->commit();
+    } catch (Throwable $exception) {
+        if ($pdo->inTransaction()) {
+            $pdo->rollBack();
+        }
+        throw $exception;
+    }
+
+    jsonResponse([
+        'success' => true,
+        'room' => [
+            'code' => $roomCode,
+            'status' => 'active',
+            'player_count' => 2,
+        ],
+        'self' => [
+            'token' => $playerToken,
+            'slot' => 2,
+            'display_name' => $displayName,
+        ],
+    ]);
+}
+
+function updatePlayerState(array $payload): void
+{
+    $roomCode = normalizeRoomCode((string) ($payload['room_code'] ?? ''));
+    $playerToken = trim((string) ($payload['player_token'] ?? ''));
+
+    if ($roomCode === '' || $playerToken === '') {
+        jsonResponse(['success' => false, 'error' => 'Room code and player token are required.'], 422);
+    }
+
+    $boardStateJson = encodeNullableJson($payload['board'] ?? null);
+    $pieceStateJson = encodeNullableJson($payload['piece'] ?? null);
+    $metaJson = encodeNullableJson($payload['meta'] ?? null);
+
+    $score = max(0, (int) ($payload['score'] ?? 0));
+    $linesCleared = max(0, (int) ($payload['lines'] ?? 0));
+    $level = max(1, (int) ($payload['level'] ?? 1));
+    $gameStatus = normalizeGameStatus((string) ($payload['game_status'] ?? 'ready'));
+
+    $pdo = db();
+    $player = fetchPlayerForRoom($pdo, $roomCode, $playerToken);
+    if (!$player) {
+        jsonResponse(['success' => false, 'error' => 'Player or room not found.'], 404);
+    }
+
+    $updatePlayer = $pdo->prepare(
+        'UPDATE tetris_room_players SET board_state_json = :board_state_json, piece_state_json = :piece_state_json, meta_json = :meta_json, '
+        . 'score = :score, lines_cleared = :lines_cleared, level = :level, game_status = :game_status, connection_status = :connection_status, '
+        . 'last_seen_at = UTC_TIMESTAMP() WHERE id = :player_id'
+    );
+    $updatePlayer->bindValue(':board_state_json', $boardStateJson, $boardStateJson === null ? PDO::PARAM_NULL : PDO::PARAM_STR);
+    $updatePlayer->bindValue(':piece_state_json', $pieceStateJson, $pieceStateJson === null ? PDO::PARAM_NULL : PDO::PARAM_STR);
+    $updatePlayer->bindValue(':meta_json', $metaJson, $metaJson === null ? PDO::PARAM_NULL : PDO::PARAM_STR);
+    $updatePlayer->bindValue(':score', $score, PDO::PARAM_INT);
+    $updatePlayer->bindValue(':lines_cleared', $linesCleared, PDO::PARAM_INT);
+    $updatePlayer->bindValue(':level', $level, PDO::PARAM_INT);
+    $updatePlayer->bindValue(':game_status', $gameStatus, PDO::PARAM_STR);
+    $updatePlayer->bindValue(':connection_status', 'connected', PDO::PARAM_STR);
+    $updatePlayer->bindValue(':player_id', (int) $player['player_id'], PDO::PARAM_INT);
+    $updatePlayer->execute();
+
+    $roomStatus = 'active';
+    $updateRoom = $pdo->prepare('UPDATE tetris_rooms SET status = :status, expires_at = (UTC_TIMESTAMP() + INTERVAL 12 HOUR) WHERE id = :room_id');
+    $updateRoom->bindValue(':status', $roomStatus, PDO::PARAM_STR);
+    $updateRoom->bindValue(':room_id', (int) $player['room_id'], PDO::PARAM_INT);
+    $updateRoom->execute();
+
+    jsonResponse([
+        'success' => true,
+        'room' => [
+            'code' => $roomCode,
+            'status' => $roomStatus,
+            'updated_at' => gmdate('c'),
+        ],
+    ]);
+}
+
+function getRoomState(array $payload): void
+{
+    $roomCode = normalizeRoomCode((string) ($payload['room_code'] ?? ''));
+    $playerToken = trim((string) ($payload['player_token'] ?? ''));
+
+    if ($roomCode === '' || $playerToken === '') {
+        jsonResponse(['success' => false, 'error' => 'Room code and player token are required.'], 422);
+    }
+
+    $pdo = db();
+    $self = fetchPlayerForRoom($pdo, $roomCode, $playerToken);
+    if (!$self) {
+        jsonResponse(['success' => false, 'error' => 'Player or room not found.'], 404);
+    }
+
+    $touchStmt = $pdo->prepare('UPDATE tetris_room_players SET last_seen_at = UTC_TIMESTAMP(), connection_status = :connection_status WHERE id = :player_id');
+    $touchStmt->bindValue(':connection_status', 'connected', PDO::PARAM_STR);
+    $touchStmt->bindValue(':player_id', (int) $self['player_id'], PDO::PARAM_INT);
+    $touchStmt->execute();
+
+    $playersStmt = $pdo->prepare(
+        'SELECT p.id, p.player_slot, p.display_name, p.connection_status, p.game_status, p.score, p.lines_cleared, p.level, '
+        . 'p.board_state_json, p.piece_state_json, p.meta_json, p.last_seen_at, r.room_code, r.status AS room_status, r.updated_at AS room_updated_at '
+        . 'FROM tetris_room_players p '
+        . 'INNER JOIN tetris_rooms r ON r.id = p.room_id '
+        . 'WHERE r.id = :room_id '
+        . 'ORDER BY p.player_slot ASC'
+    );
+    $playersStmt->bindValue(':room_id', (int) $self['room_id'], PDO::PARAM_INT);
+    $playersStmt->execute();
+    $rows = $playersStmt->fetchAll();
+
+    $players = [];
+    foreach ($rows as $row) {
+        $players[] = [
+            'slot' => (int) $row['player_slot'],
+            'display_name' => (string) $row['display_name'],
+            'connection_status' => (string) $row['connection_status'],
+            'game_status' => (string) $row['game_status'],
+            'score' => (int) $row['score'],
+            'lines' => (int) $row['lines_cleared'],
+            'level' => (int) $row['level'],
+            'board' => decodeNullableJson($row['board_state_json'] ?? null),
+            'piece' => decodeNullableJson($row['piece_state_json'] ?? null),
+            'meta' => decodeNullableJson($row['meta_json'] ?? null),
+            'last_seen_at' => (string) $row['last_seen_at'],
+            'is_self' => ((int) ($row['player_slot'] ?? 0)) === ((int) $self['player_slot']),
+        ];
+    }
+
+    $playerCount = count($players);
+    $connectedCount = 0;
+    foreach ($players as $player) {
+        if ($player['connection_status'] === 'connected') {
+            $connectedCount++;
+        }
+    }
+
+    $roomStatus = $playerCount >= 2 ? 'active' : 'waiting';
+    if ($connectedCount === 0) {
+        $roomStatus = 'closed';
+    }
+
+    $roomUpdateStmt = $pdo->prepare('UPDATE tetris_rooms SET status = :status, expires_at = (UTC_TIMESTAMP() + INTERVAL 12 HOUR) WHERE id = :room_id');
+    $roomUpdateStmt->bindValue(':status', $roomStatus, PDO::PARAM_STR);
+    $roomUpdateStmt->bindValue(':room_id', (int) $self['room_id'], PDO::PARAM_INT);
+    $roomUpdateStmt->execute();
+
+    jsonResponse([
+        'success' => true,
+        'room' => [
+            'code' => $roomCode,
+            'status' => $roomStatus,
+            'player_count' => $playerCount,
+        ],
+        'self' => [
+            'slot' => (int) $self['player_slot'],
+            'display_name' => (string) $self['display_name'],
+        ],
+        'players' => $players,
+    ]);
+}
+
+function leaveRoom(array $payload): void
+{
+    $roomCode = normalizeRoomCode((string) ($payload['room_code'] ?? ''));
+    $playerToken = trim((string) ($payload['player_token'] ?? ''));
+
+    if ($roomCode === '' || $playerToken === '') {
+        jsonResponse(['success' => false, 'error' => 'Room code and player token are required.'], 422);
+    }
+
+    $pdo = db();
+    $player = fetchPlayerForRoom($pdo, $roomCode, $playerToken);
+    if (!$player) {
+        jsonResponse(['success' => false, 'error' => 'Player or room not found.'], 404);
+    }
+
+    $disconnectStmt = $pdo->prepare('UPDATE tetris_room_players SET connection_status = :connection_status, game_status = :game_status, last_seen_at = UTC_TIMESTAMP() WHERE id = :player_id');
+    $disconnectStmt->bindValue(':connection_status', 'disconnected', PDO::PARAM_STR);
+    $disconnectStmt->bindValue(':game_status', 'paused', PDO::PARAM_STR);
+    $disconnectStmt->bindValue(':player_id', (int) $player['player_id'], PDO::PARAM_INT);
+    $disconnectStmt->execute();
+
+    $countConnectedStmt = $pdo->prepare('SELECT COUNT(*) FROM tetris_room_players WHERE room_id = :room_id AND connection_status = :connection_status');
+    $countConnectedStmt->bindValue(':room_id', (int) $player['room_id'], PDO::PARAM_INT);
+    $countConnectedStmt->bindValue(':connection_status', 'connected', PDO::PARAM_STR);
+    $countConnectedStmt->execute();
+    $connectedCount = (int) $countConnectedStmt->fetchColumn();
+
+    $roomStatus = $connectedCount > 0 ? 'active' : 'closed';
+    $updateRoom = $pdo->prepare('UPDATE tetris_rooms SET status = :status WHERE id = :room_id');
+    $updateRoom->bindValue(':status', $roomStatus, PDO::PARAM_STR);
+    $updateRoom->bindValue(':room_id', (int) $player['room_id'], PDO::PARAM_INT);
+    $updateRoom->execute();
+
+    jsonResponse([
+        'success' => true,
+        'room' => [
+            'code' => $roomCode,
+            'status' => $roomStatus,
+        ],
+    ]);
+}
+
+function fetchPlayerForRoom(PDO $pdo, string $roomCode, string $playerToken): ?array
+{
+    $stmt = $pdo->prepare(
+        'SELECT p.id AS player_id, p.player_slot, p.display_name, p.room_id '
+        . 'FROM tetris_room_players p '
+        . 'INNER JOIN tetris_rooms r ON r.id = p.room_id '
+        . 'WHERE r.room_code = :room_code AND p.player_token = :player_token LIMIT 1'
+    );
+    $stmt->bindValue(':room_code', $roomCode, PDO::PARAM_STR);
+    $stmt->bindValue(':player_token', $playerToken, PDO::PARAM_STR);
+    $stmt->execute();
+    $row = $stmt->fetch();
+
+    return is_array($row) ? $row : null;
+}
+
+function encodeNullableJson($value): ?string
+{
+    if ($value === null || $value === '') {
+        return null;
+    }
+
+    return json_encode($value, JSON_UNESCAPED_SLASHES);
+}
+
+function decodeNullableJson($value)
+{
+    if ($value === null || $value === '') {
+        return null;
+    }
+
+    return json_decode((string) $value, true);
+}
+
+function normalizeGameStatus(string $gameStatus): string
+{
+    $normalized = strtolower(trim($gameStatus));
+    $allowed = ['ready', 'playing', 'paused', 'game_over'];
+
+    return in_array($normalized, $allowed, true) ? $normalized : 'ready';
+}
diff --git a/api/scoreboard.php b/api/scoreboard.php
new file mode 100644
index 0000000..549d822
--- /dev/null
+++ b/api/scoreboard.php
@@ -0,0 +1,173 @@
+<?php
+declare(strict_types=1);
+
+header('Content-Type: application/json; charset=utf-8');
+header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
+
+require_once __DIR__ . '/../db/config.php';
+require_once __DIR__ . '/../db/migrate.php';
+
+run_migrations();
+
+try {
+    $method = strtoupper((string) ($_SERVER['REQUEST_METHOD'] ?? 'GET'));
+
+    if ($method === 'GET') {
+        listScores((int) ($_GET['limit'] ?? 10));
+    }
+
+    if ($method !== 'POST') {
+        jsonResponse(['success' => false, 'error' => 'Method not allowed.'], 405);
+    }
+
+    $raw = file_get_contents('php://input');
+    $payload = json_decode($raw ?: '[]', true);
+    if (!is_array($payload)) {
+        jsonResponse(['success' => false, 'error' => 'Invalid JSON payload.'], 400);
+    }
+
+    $action = (string) ($payload['action'] ?? '');
+    if ($action === 'save_score') {
+        saveScore($payload);
+    }
+
+    if ($action === 'list_scores') {
+        listScores((int) ($payload['limit'] ?? 10));
+    }
+
+    jsonResponse(['success' => false, 'error' => 'Unknown action.'], 422);
+} catch (Throwable $exception) {
+    error_log('Scoreboard API error: ' . $exception->getMessage());
+    jsonResponse(['success' => false, 'error' => 'Scoreboard is temporarily unavailable.'], 500);
+}
+
+function saveScore(array $payload): void
+{
+    $playerName = normalizePlayerName((string) ($payload['player_name'] ?? ''));
+    $score = max(0, (int) ($payload['score'] ?? 0));
+    $linesCleared = max(0, (int) ($payload['lines'] ?? 0));
+    $level = max(1, (int) ($payload['level'] ?? 1));
+    $piecesPlaced = max(0, (int) ($payload['pieces_placed'] ?? 0));
+    $durationSeconds = max(0, (int) ($payload['duration_seconds'] ?? 0));
+    $roomCode = normalizeRoomCode((string) ($payload['room_code'] ?? ''));
+    $mode = $roomCode !== '' ? 'multiplayer' : 'solo';
+
+    $pdo = db();
+    $insert = $pdo->prepare(
+        'INSERT INTO tetris_scores (player_name, score, lines_cleared, level, pieces_placed, duration_seconds, mode, room_code) '
+        . 'VALUES (:player_name, :score, :lines_cleared, :level, :pieces_placed, :duration_seconds, :mode, :room_code)'
+    );
+    $insert->bindValue(':player_name', $playerName, PDO::PARAM_STR);
+    $insert->bindValue(':score', $score, PDO::PARAM_INT);
+    $insert->bindValue(':lines_cleared', $linesCleared, PDO::PARAM_INT);
+    $insert->bindValue(':level', $level, PDO::PARAM_INT);
+    $insert->bindValue(':pieces_placed', $piecesPlaced, PDO::PARAM_INT);
+    $insert->bindValue(':duration_seconds', $durationSeconds, PDO::PARAM_INT);
+    $insert->bindValue(':mode', $mode, PDO::PARAM_STR);
+    if ($roomCode === '') {
+        $insert->bindValue(':room_code', null, PDO::PARAM_NULL);
+    } else {
+        $insert->bindValue(':room_code', $roomCode, PDO::PARAM_STR);
+    }
+    $insert->execute();
+
+    $scoreId = (int) $pdo->lastInsertId();
+
+    $placementQuery = $pdo->prepare(
+        'SELECT COUNT(*) FROM tetris_scores WHERE '
+        . 'score > :score '
+        . 'OR (score = :score AND lines_cleared > :lines_cleared) '
+        . 'OR (score = :score AND lines_cleared = :lines_cleared AND level > :level) '
+        . 'OR (score = :score AND lines_cleared = :lines_cleared AND level = :level AND duration_seconds < :duration_seconds) '
+        . 'OR (score = :score AND lines_cleared = :lines_cleared AND level = :level AND duration_seconds = :duration_seconds AND id < :score_id)'
+    );
+    $placementQuery->bindValue(':score', $score, PDO::PARAM_INT);
+    $placementQuery->bindValue(':lines_cleared', $linesCleared, PDO::PARAM_INT);
+    $placementQuery->bindValue(':level', $level, PDO::PARAM_INT);
+    $placementQuery->bindValue(':duration_seconds', $durationSeconds, PDO::PARAM_INT);
+    $placementQuery->bindValue(':score_id', $scoreId, PDO::PARAM_INT);
+    $placementQuery->execute();
+    $placement = ((int) $placementQuery->fetchColumn()) + 1;
+
+    jsonResponse([
+        'success' => true,
+        'entry' => [
+            'id' => $scoreId,
+            'player_name' => $playerName,
+            'score' => $score,
+            'lines' => $linesCleared,
+            'level' => $level,
+            'pieces_placed' => $piecesPlaced,
+            'duration_seconds' => $durationSeconds,
+            'mode' => $mode,
+            'room_code' => $roomCode !== '' ? $roomCode : null,
+        ],
+        'placement' => $placement,
+    ]);
+}
+
+function listScores(int $limit = 10): void
+{
+    $limit = max(1, min(25, $limit));
+
+    $pdo = db();
+    $stmt = $pdo->prepare(
+        'SELECT id, player_name, score, lines_cleared, level, pieces_placed, duration_seconds, mode, room_code, created_at '
+        . 'FROM tetris_scores '
+        . 'ORDER BY score DESC, lines_cleared DESC, level DESC, duration_seconds ASC, id ASC '
+        . 'LIMIT :limit'
+    );
+    $stmt->bindValue(':limit', $limit, PDO::PARAM_INT);
+    $stmt->execute();
+
+    $scores = [];
+    foreach ($stmt->fetchAll() as $row) {
+        $scores[] = [
+            'id' => (int) $row['id'],
+            'player_name' => (string) $row['player_name'],
+            'score' => (int) $row['score'],
+            'lines' => (int) $row['lines_cleared'],
+            'level' => (int) $row['level'],
+            'pieces_placed' => (int) $row['pieces_placed'],
+            'duration_seconds' => (int) $row['duration_seconds'],
+            'mode' => (string) $row['mode'],
+            'room_code' => $row['room_code'] !== null ? (string) $row['room_code'] : null,
+            'created_at' => (string) $row['created_at'],
+        ];
+    }
+
+    jsonResponse([
+        'success' => true,
+        'scores' => $scores,
+        'limit' => $limit,
+    ]);
+}
+
+function normalizePlayerName(string $value): string
+{
+    $value = trim(preg_replace('/\s+/', ' ', $value) ?? '');
+    $value = preg_replace('/[^\p{L}\p{N} ._\-]/u', '', $value) ?? '';
+    if ($value === '') {
+        return 'Player';
+    }
+
+    if (function_exists('mb_substr')) {
+        return mb_substr($value, 0, 48);
+    }
+
+    return substr($value, 0, 48);
+}
+
+function normalizeRoomCode(string $value): string
+{
+    $value = strtoupper(trim($value));
+    $value = preg_replace('/[^A-Z0-9]/', '', $value) ?? '';
+    return substr($value, 0, 8);
+}
+
+function jsonResponse(array $payload, int $status = 200): void
+{
+    http_response_code($status);
+    echo json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+    exit;
+}
diff --git a/assets/css/custom.css b/assets/css/custom.css
index 789132e..6a3f93f 100644
--- a/assets/css/custom.css
+++ b/assets/css/custom.css
@@ -1,403 +1,576 @@
+:root {
+    --bg: #0b0d12;
+    --bg-elevated: #12161d;
+    --surface: #161b22;
+    --surface-strong: #1d242d;
+    --surface-soft: #11161d;
+    --border: #27303a;
+    --border-strong: #37424f;
+    --text: #edf1f5;
+    --muted: #98a2ad;
+    --accent: #d2b062;
+    --accent-soft: rgba(210, 176, 98, 0.12);
+    --success: #79c08f;
+    --danger: #e37979;
+    --shadow: 0 24px 60px rgba(0, 0, 0, 0.38);
+    --radius-sm: 8px;
+    --radius-md: 12px;
+    --radius-lg: 16px;
+    --spacing-1: 0.25rem;
+    --spacing-2: 0.5rem;
+    --spacing-3: 0.75rem;
+    --spacing-4: 1rem;
+    --spacing-5: 1.5rem;
+    --spacing-6: 2rem;
+}
+
+html,
 body {
-    background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
-    background-size: 400% 400%;
-    animation: gradient 15s ease infinite;
-    color: #212529;
-    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
-    font-size: 14px;
+    min-height: 100%;
+}
+
+body.tetris-body {
     margin: 0;
+    background-color: var(--bg);
+    color: var(--text);
+    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+    letter-spacing: -0.01em;
+}
+
+::selection {
+    background: rgba(210, 176, 98, 0.24);
+}
+
+.page-shell {
     min-height: 100vh;
 }
 
-.main-wrapper {
-    display: flex;
-    align-items: center;
-    justify-content: center;
-    min-height: 100vh;
-    width: 100%;
-    padding: 20px;
-    box-sizing: border-box;
-    position: relative;
-    z-index: 1;
-}
-
-@keyframes gradient {
-    0% {
-        background-position: 0% 50%;
-    }
-    50% {
-        background-position: 100% 50%;
-    }
-    100% {
-        background-position: 0% 50%;
-    }
-}
-
-.chat-container {
-    width: 100%;
-    max-width: 600px;
-    background: rgba(255, 255, 255, 0.85);
-    border: 1px solid rgba(255, 255, 255, 0.3);
-    border-radius: 20px;
-    display: flex;
-    flex-direction: column;
-    height: 85vh;
-    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
-    backdrop-filter: blur(15px);
-    -webkit-backdrop-filter: blur(15px);
-    overflow: hidden;
-}
-
-.chat-header {
-    padding: 1.5rem;
-    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
-    background: rgba(255, 255, 255, 0.5);
-    font-weight: 700;
-    font-size: 1.1rem;
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-}
-
-.chat-messages {
-    flex: 1;
-    overflow-y: auto;
-    padding: 1.5rem;
-    display: flex;
-    flex-direction: column;
-    gap: 1.25rem;
-}
-
-/* Custom Scrollbar */
-::-webkit-scrollbar {
-    width: 6px;
-}
-
-::-webkit-scrollbar-track {
-    background: transparent;
-}
-
-::-webkit-scrollbar-thumb {
-    background: rgba(255, 255, 255, 0.3);
-    border-radius: 10px;
-}
-
-::-webkit-scrollbar-thumb:hover {
-    background: rgba(255, 255, 255, 0.5);
-}
-
-.message {
-    max-width: 85%;
-    padding: 0.85rem 1.1rem;
-    border-radius: 16px;
-    line-height: 1.5;
-    font-size: 0.95rem;
-    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
-    animation: fadeIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
-}
-
-@keyframes fadeIn {
-    from { opacity: 0; transform: translateY(20px) scale(0.95); }
-    to { opacity: 1; transform: translateY(0) scale(1); }
-}
-
-.message.visitor {
-    align-self: flex-end;
-    background: linear-gradient(135deg, #212529 0%, #343a40 100%);
-    color: #fff;
-    border-bottom-right-radius: 4px;
-}
-
-.message.bot {
-    align-self: flex-start;
-    background: #ffffff;
-    color: #212529;
-    border-bottom-left-radius: 4px;
-}
-
-.chat-input-area {
-    padding: 1.25rem;
-    background: rgba(255, 255, 255, 0.5);
-    border-top: 1px solid rgba(0, 0, 0, 0.05);
-}
-
-.chat-input-area form {
-    display: flex;
-    gap: 0.75rem;
-}
-
-.chat-input-area input {
-    flex: 1;
-    border: 1px solid rgba(0, 0, 0, 0.1);
-    border-radius: 12px;
-    padding: 0.75rem 1rem;
-    outline: none;
-    background: rgba(255, 255, 255, 0.9);
-    transition: all 0.3s ease;
-}
-
-.chat-input-area input:focus {
-    border-color: #23a6d5;
-    box-shadow: 0 0 0 3px rgba(35, 166, 213, 0.2);
-}
-
-.chat-input-area button {
-    background: #212529;
-    color: #fff;
-    border: none;
-    padding: 0.75rem 1.5rem;
-    border-radius: 12px;
-    cursor: pointer;
-    font-weight: 600;
-    transition: all 0.3s ease;
-}
-
-.chat-input-area button:hover {
-    background: #000;
-    transform: translateY(-2px);
-    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
-}
-
-/* Background Animations */
-.bg-animations {
-    position: fixed;
+.app-header {
+    position: sticky;
     top: 0;
-    left: 0;
-    width: 100%;
-    height: 100%;
-    z-index: 0;
-    overflow: hidden;
-    pointer-events: none;
+    z-index: 20;
+    backdrop-filter: blur(14px);
+    background: rgba(11, 13, 18, 0.92);
 }
 
-.blob {
-    position: absolute;
-    width: 500px;
-    height: 500px;
-    background: rgba(255, 255, 255, 0.2);
-    border-radius: 50%;
-    filter: blur(80px);
-    animation: move 20s infinite alternate cubic-bezier(0.45, 0, 0.55, 1);
-}
-
-.blob-1 { 
-    top: -10%; 
-    left: -10%; 
-    background: rgba(238, 119, 82, 0.4); 
-}
-
-.blob-2 { 
-    bottom: -10%; 
-    right: -10%; 
-    background: rgba(35, 166, 213, 0.4); 
-    animation-delay: -7s; 
-    width: 600px;
-    height: 600px;
-}
-
-.blob-3 { 
-    top: 40%; 
-    left: 30%; 
-    background: rgba(231, 60, 126, 0.3); 
-    animation-delay: -14s; 
-    width: 450px;
-    height: 450px;
-}
-
-@keyframes move {
-    0% { transform: translate(0, 0) rotate(0deg) scale(1); }
-    33% { transform: translate(150px, 100px) rotate(120deg) scale(1.1); }
-    66% { transform: translate(-50px, 200px) rotate(240deg) scale(0.9); }
-    100% { transform: translate(0, 0) rotate(360deg) scale(1); }
-}
-
-.header-link {
-    font-size: 14px;
-    color: #fff;
-    text-decoration: none;
-    background: rgba(0, 0, 0, 0.2);
-    padding: 0.5rem 1rem;
-    border-radius: 8px;
-    transition: all 0.3s ease;
-}
-
-.header-link:hover {
-    background: rgba(0, 0, 0, 0.4);
-    text-decoration: none;
-}
-
-/* Admin Styles */
-.admin-container {
-    max-width: 900px;
-    margin: 3rem auto;
-    padding: 2.5rem;
-    background: rgba(255, 255, 255, 0.85);
-    backdrop-filter: blur(20px);
-    -webkit-backdrop-filter: blur(20px);
-    border-radius: 24px;
-    box-shadow: 0 20px 50px rgba(0,0,0,0.15);
-    border: 1px solid rgba(255, 255, 255, 0.4);
-    position: relative;
-    z-index: 1;
-}
-
-.admin-container h1 {
-    margin-top: 0;
-    color: #212529;
-    font-weight: 800;
-}
-
-.table {
-    width: 100%;
-    border-collapse: separate;
-    border-spacing: 0 8px;
-    margin-top: 1.5rem;
-}
-
-.table th {
-    background: transparent;
-    border: none;
-    padding: 1rem;
-    color: #6c757d;
-    font-weight: 600;
+.eyebrow,
+.panel-label {
+    font-size: 0.72rem;
+    letter-spacing: 0.14em;
     text-transform: uppercase;
-    font-size: 0.75rem;
-    letter-spacing: 1px;
+    color: var(--muted);
 }
 
-.table td {
-    background: #fff;
-    padding: 1rem;
-    border: none;
+.app-title {
+    font-size: clamp(1.4rem, 2vw, 1.9rem);
+    font-weight: 700;
+    color: var(--text);
 }
 
-.table tr td:first-child { border-radius: 12px 0 0 12px; }
-.table tr td:last-child { border-radius: 0 12px 12px 0; }
-
-.form-group {
-    margin-bottom: 1.25rem;
-}
-
-.form-group label {
-    display: block;
-    margin-bottom: 0.5rem;
+.status-badge {
+    border: 1px solid var(--border);
+    background: var(--surface-strong) !important;
+    color: var(--text);
+    padding: 0.55rem 0.75rem;
     font-weight: 600;
-    font-size: 0.9rem;
 }
 
-.form-control {
-    width: 100%;
-    padding: 0.75rem 1rem;
-    border: 1px solid rgba(0, 0, 0, 0.1);
-    border-radius: 12px;
-    background: #fff;
-    transition: all 0.3s ease;
-    box-sizing: border-box;
+.control-btn {
+    min-width: 92px;
 }
 
-.form-control:focus {
-    outline: none;
-    border-color: #23a6d5;
-    box-shadow: 0 0 0 3px rgba(35, 166, 213, 0.1);
+.status-badge.state-ready {
+    background: rgba(39, 48, 58, 0.9) !important;
 }
 
-.header-container {
-    display: flex;
-    justify-content: space-between;
+.status-badge.state-playing {
+    background: rgba(210, 176, 98, 0.16) !important;
+    color: #f3e6c8;
+    border-color: rgba(210, 176, 98, 0.5);
+}
+
+.status-badge.state-paused {
+    background: rgba(122, 141, 182, 0.16) !important;
+    color: #d3deef;
+    border-color: rgba(122, 141, 182, 0.4);
+}
+
+.status-badge.state-game-over {
+    background: rgba(203, 125, 125, 0.16) !important;
+    color: #f3d6d6;
+    border-color: rgba(203, 125, 125, 0.4);
+}
+
+.panel {
+    background: rgba(18, 22, 29, 0.96);
+    border: 1px solid var(--border);
+    border-radius: var(--radius-lg);
+    box-shadow: var(--shadow);
+    padding: var(--spacing-5);
+}
+
+.compact-panel {
+    padding: 1.1rem;
+}
+
+.panel-header {
+    margin-bottom: 1rem;
+}
+
+.panel-title {
+    font-size: 1.05rem;
+    font-weight: 650;
+    margin: 0;
+}
+
+.panel-inline-stats {
+    color: var(--muted);
+}
+
+.inline-chip {
+    display: inline-flex;
     align-items: center;
+    gap: 0.5rem;
+    padding: 0.5rem 0.75rem;
+    border: 1px solid var(--border);
+    border-radius: 999px;
+    background: rgba(17, 22, 29, 0.72);
+    font-size: 0.85rem;
 }
 
-.header-links {
-    display: flex;
+.board-layout {
+    display: grid;
     gap: 1rem;
 }
 
-.admin-card {
-    background: rgba(255, 255, 255, 0.6);
-    padding: 2rem;
-    border-radius: 20px;
-    border: 1px solid rgba(255, 255, 255, 0.5);
-    margin-bottom: 2.5rem;
-    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
+.board-frame {
+    position: relative;
+    border-radius: var(--radius-lg);
+    overflow: hidden;
+    border: 1px solid var(--border-strong);
+    background: #0e1218;
 }
 
-.admin-card h3 {
-    margin-top: 0;
-    margin-bottom: 1.5rem;
+#tetris-board {
+    display: block;
+    width: auto;
+    max-width: 100%;
+    height: min(60vh, 560px);
+    aspect-ratio: 1 / 2;
+    margin-inline: auto;
+    background: transparent;
+}
+
+.board-overlay {
+    position: absolute;
+    inset: 0;
+    display: grid;
+    place-items: center;
+    padding: 1.5rem;
+    text-align: center;
+    background: rgba(11, 13, 18, 0.82);
+    color: var(--text);
+    transition: opacity 180ms ease, visibility 180ms ease;
+}
+
+.board-overlay.hidden {
+    opacity: 0;
+    visibility: hidden;
+    pointer-events: none;
+}
+
+.overlay-label {
+    font-size: 0.8rem;
+    text-transform: uppercase;
+    letter-spacing: 0.16em;
+    color: var(--accent);
+}
+
+.overlay-title {
+    font-size: clamp(1.4rem, 4vw, 2.1rem);
     font-weight: 700;
 }
 
-.btn-delete {
-    background: #dc3545;
-    color: white;
-    border: none;
-    padding: 0.25rem 0.5rem;
-    border-radius: 4px;
-    cursor: pointer;
+.overlay-copy {
+    color: var(--muted);
+    max-width: 34rem;
 }
 
-.btn-add {
-    background: #212529;
-    color: white;
-    border: none;
-    padding: 0.5rem 1rem;
-    border-radius: 4px;
-    cursor: pointer;
-    margin-top: 1rem;
+.stats-grid {
+    display: grid;
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+    gap: 0.9rem;
 }
 
-.btn-save {
-    background: #0088cc;
-    color: white;
-    border: none;
-    padding: 0.8rem 1.5rem;
-    border-radius: 12px;
-    cursor: pointer;
-    font-weight: 600;
-    width: 100%;
-    transition: all 0.3s ease;
+.stat-card,
+.history-detail,
+.preview-wrap {
+    border: 1px solid var(--border);
+    border-radius: var(--radius-md);
+    background: rgba(14, 18, 24, 0.92);
 }
 
-.webhook-url {
-    font-size: 0.85em;
-    color: #555;
-    margin-top: 0.5rem;
-}
-
-.history-table-container {
-    overflow-x: auto;
-    background: rgba(255, 255, 255, 0.4);
+.stat-card {
     padding: 1rem;
-    border-radius: 12px;
-    border: 1px solid rgba(255, 255, 255, 0.3);
 }
 
-.history-table {
+.stat-label,
+.summary-label,
+.history-detail-header,
+.detail-grid dt {
+    display: block;
+    color: var(--muted);
+    font-size: 0.78rem;
+    text-transform: uppercase;
+    letter-spacing: 0.08em;
+}
+
+.stat-value {
+    display: block;
+    margin-top: 0.25rem;
+    font-size: clamp(1.2rem, 2vw, 1.55rem);
+    font-weight: 700;
+}
+
+.preview-wrap {
+    padding: 0.75rem;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    min-height: 176px;
+}
+
+#next-piece {
+    width: 144px;
+    height: 144px;
+}
+
+.multiplayer-block .form-control {
+    background: var(--surface-soft);
+    border-color: var(--border);
+    color: var(--text);
+}
+
+.multiplayer-block .form-control:focus {
+    background: var(--surface-soft);
+    border-color: var(--accent);
+    box-shadow: 0 0 0 0.2rem rgba(210, 176, 98, 0.15);
+}
+
+.room-code-card {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 0.75rem;
+    padding: 0.75rem 0.9rem;
+    border: 1px dashed var(--border-strong);
+    border-radius: var(--radius-md);
+    background: rgba(14, 18, 24, 0.6);
+}
+
+.room-code-label {
+    display: block;
+    color: var(--muted);
+    font-size: 0.7rem;
+    text-transform: uppercase;
+    letter-spacing: 0.16em;
+}
+
+.room-code-value {
+    font-size: 1.1rem;
+    font-weight: 700;
+    letter-spacing: 0.2em;
+}
+
+.room-status .status-badge {
+    font-size: 0.75rem;
+}
+
+.opponent-wrap {
+    display: grid;
+    gap: 0.75rem;
+}
+
+#opponent-board {
     width: 100%;
+    max-width: 240px;
+    height: auto;
+    margin: 0 auto;
+    aspect-ratio: 1 / 2;
+    border: 1px solid var(--border-strong);
+    border-radius: var(--radius-md);
+    background: #0e1218;
 }
 
-.history-table-time {
-    width: 15%;
-    white-space: nowrap;
-    font-size: 0.85em;
-    color: #555;
+.opponent-name {
+    font-weight: 600;
 }
 
-.history-table-user {
-    width: 35%;
-    background: rgba(255, 255, 255, 0.3);
-    border-radius: 8px;
-    padding: 8px;
+.detail-grid {
+    display: grid;
+    gap: 0.9rem;
+    grid-template-columns: repeat(2, minmax(0, 1fr));
 }
 
-.history-table-ai {
-    width: 50%;
-    background: rgba(255, 255, 255, 0.5);
-    border-radius: 8px;
-    padding: 8px;
+.detail-grid.compact {
+    gap: 0.75rem;
 }
 
-.no-messages {
+.detail-grid .full {
+    grid-column: 1 / -1;
+}
+
+.detail-grid dd {
+    margin: 0.28rem 0 0;
+    font-size: 1rem;
+    font-weight: 600;
+}
+
+.controls-list {
+    display: grid;
+    gap: 0.7rem;
+}
+
+.controls-list li {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    gap: 0.75rem;
+    color: var(--text);
+    font-size: 0.92rem;
+    padding-bottom: 0.65rem;
+    border-bottom: 1px solid rgba(39, 48, 58, 0.7);
+}
+
+.controls-list li:last-child {
+    padding-bottom: 0;
+    border-bottom: 0;
+}
+
+kbd {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    min-width: 2rem;
+    padding: 0.28rem 0.5rem;
+    margin-left: 0.35rem;
+    border-radius: var(--radius-sm);
+    border: 1px solid var(--border-strong);
+    background: var(--surface-soft);
+    color: var(--text);
+    font-size: 0.78rem;
+    font-family: inherit;
+    box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.04);
+}
+
+.empty-state {
+    padding: 0.95rem 1rem;
+    border: 1px dashed var(--border-strong);
+    border-radius: var(--radius-md);
+    color: var(--muted);
+    background: rgba(14, 18, 24, 0.5);
+    font-size: 0.92rem;
+}
+
+.history-list {
+    display: grid;
+    gap: 0.75rem;
+}
+
+.history-item {
+    width: 100%;
+    text-align: left;
+    border: 1px solid var(--border);
+    border-radius: var(--radius-md);
+    background: rgba(14, 18, 24, 0.88);
+    padding: 0.9rem 1rem;
+    color: var(--text);
+    transition: border-color 140ms ease, transform 140ms ease, background-color 140ms ease;
+}
+
+.history-item:hover,
+.history-item:focus-visible {
+    border-color: var(--accent);
+    background: rgba(17, 22, 29, 1);
+    transform: translateY(-1px);
+    outline: none;
+}
+
+.history-item.active {
+    border-color: var(--accent);
+    background: rgba(210, 176, 98, 0.08);
+}
+
+.history-topline,
+.history-subline {
+    display: flex;
+    justify-content: space-between;
+    gap: 0.75rem;
+}
+
+.history-score {
+    font-weight: 700;
+}
+
+.history-meta,
+.history-date {
+    color: var(--muted);
+    font-size: 0.82rem;
+}
+
+.history-detail {
+    margin-top: 0.85rem;
+    padding: 0.95rem 1rem;
+}
+
+.summary-grid {
+    display: grid;
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+    gap: 1rem;
+    margin-bottom: 1rem;
+}
+
+.summary-grid strong {
+    display: block;
+    margin-top: 0.25rem;
+    font-size: 1.3rem;
+}
+
+.modal-copy,
+.toast-body,
+.text-secondary {
+    color: var(--muted) !important;
+}
+
+.btn-light {
+    background: #f5f7f8;
+    border-color: #f5f7f8;
+}
+
+.btn-outline-light {
+    border-color: var(--border-strong);
+    color: var(--text);
+}
+
+.btn-outline-light:hover,
+.btn-outline-light:focus-visible {
+    background: var(--surface-strong);
+    border-color: var(--accent);
+    color: var(--text);
+}
+
+.btn:focus-visible,
+.history-item:focus-visible {
+    box-shadow: 0 0 0 0.2rem rgba(210, 176, 98, 0.18);
+}
+
+.toast,
+.modal-content {
+    border-radius: var(--radius-md);
+}
+
+@media (max-width: 991.98px) {
+    .app-header {
+        position: static;
+    }
+
+    .panel {
+        padding: 1rem;
+    }
+}
+
+@media (max-width: 575.98px) {
+    #tetris-board {
+        height: min(52vh, 460px);
+    }
+
+    .stats-grid,
+    .detail-grid,
+    .summary-grid {
+        grid-template-columns: 1fr 1fr;
+    }
+
+    .controls-list li {
+        align-items: flex-start;
+        flex-direction: column;
+    }
+
+    .history-topline,
+    .history-subline {
+        flex-direction: column;
+        gap: 0.2rem;
+    }
+}
+
+
+.field-help {
+    color: var(--bs-secondary-color);
+    font-size: 0.78rem;
+    line-height: 1.4;
+}
+
+.scoreboard-list {
+    display: grid;
+    gap: 0.75rem;
+}
+
+.scoreboard-item {
+    display: grid;
+    grid-template-columns: auto 1fr;
+    gap: 0.875rem;
+    align-items: start;
+    padding: 0.9rem 1rem;
+    border: 1px solid rgba(255, 255, 255, 0.08);
+    border-radius: 14px;
+    background: rgba(255, 255, 255, 0.03);
+}
+
+.scoreboard-rank {
+    min-width: 2.75rem;
+    padding: 0.35rem 0.55rem;
+    border-radius: 999px;
+    background: rgba(210, 176, 98, 0.14);
+    color: #d2b062;
+    font-size: 0.82rem;
+    font-weight: 700;
     text-align: center;
-    color: #777;
-}
\ No newline at end of file
+}
+
+.scoreboard-item-body {
+    min-width: 0;
+}
+
+.scoreboard-topline {
+    display: flex;
+    justify-content: space-between;
+    gap: 0.75rem;
+    align-items: center;
+    margin-bottom: 0.3rem;
+}
+
+.scoreboard-name,
+.scoreboard-score {
+    color: #f8f9fa;
+}
+
+.scoreboard-score {
+    white-space: nowrap;
+    font-weight: 700;
+}
+
+.scoreboard-meta {
+    color: var(--bs-secondary-color);
+    font-size: 0.82rem;
+    line-height: 1.45;
+}
+
+@media (max-width: 575.98px) {
+    .scoreboard-item {
+        grid-template-columns: 1fr;
+    }
+
+    .scoreboard-topline {
+        flex-direction: column;
+        align-items: flex-start;
+    }
+}
diff --git a/assets/js/main.js b/assets/js/main.js
index d349598..718cc0a 100644
--- a/assets/js/main.js
+++ b/assets/js/main.js
@@ -1,39 +1,1126 @@
 document.addEventListener('DOMContentLoaded', () => {
-    const chatForm = document.getElementById('chat-form');
-    const chatInput = document.getElementById('chat-input');
-    const chatMessages = document.getElementById('chat-messages');
+    const COLS = 10;
+    const ROWS = 20;
+    const BLOCK = 30;
+    const STORAGE_KEYS = {
+        best: 'tetris_best_score_v1',
+        history: 'tetris_run_history_v1'
+    };
+    const MULTI_STORAGE_KEYS = {
+        room: 'tetris_room_code_v1',
+        token: 'tetris_player_token_v1',
+        name: 'tetris_player_name_v1',
+        slot: 'tetris_player_slot_v1'
+    };
+    const MULTI_API_URL = 'api/multiplayer.php';
+    const SCOREBOARD_API_URL = 'api/scoreboard.php';
+    const MULTI_POLL_INTERVAL = 800;
+    const SCOREBOARD_TIMEOUT_MS = 4000;
 
-    const appendMessage = (text, sender) => {
-        const msgDiv = document.createElement('div');
-        msgDiv.classList.add('message', sender);
-        msgDiv.textContent = text;
-        chatMessages.appendChild(msgDiv);
-        chatMessages.scrollTop = chatMessages.scrollHeight;
+    const PIECE_DEFS = {
+        I: {
+            matrix: [
+                [0, 0, 0, 0],
+                [1, 1, 1, 1],
+                [0, 0, 0, 0],
+                [0, 0, 0, 0]
+            ],
+            color: '#7cb8c7'
+        },
+        J: {
+            matrix: [
+                [2, 0, 0],
+                [2, 2, 2],
+                [0, 0, 0]
+            ],
+            color: '#7a8db6'
+        },
+        L: {
+            matrix: [
+                [0, 0, 3],
+                [3, 3, 3],
+                [0, 0, 0]
+            ],
+            color: '#c49a63'
+        },
+        O: {
+            matrix: [
+                [4, 4],
+                [4, 4]
+            ],
+            color: '#d0b768'
+        },
+        S: {
+            matrix: [
+                [0, 5, 5],
+                [5, 5, 0],
+                [0, 0, 0]
+            ],
+            color: '#86b494'
+        },
+        T: {
+            matrix: [
+                [0, 6, 0],
+                [6, 6, 6],
+                [0, 0, 0]
+            ],
+            color: '#b18ab8'
+        },
+        Z: {
+            matrix: [
+                [7, 7, 0],
+                [0, 7, 7],
+                [0, 0, 0]
+            ],
+            color: '#cb7d7d'
+        }
     };
 
-    chatForm.addEventListener('submit', async (e) => {
-        e.preventDefault();
-        const message = chatInput.value.trim();
-        if (!message) return;
+    const colorLookup = Object.entries(PIECE_DEFS).reduce((acc, [type, def], index) => {
+        acc[index + 1] = def.color;
+        return acc;
+    }, {});
 
-        appendMessage(message, 'visitor');
-        chatInput.value = '';
+    const boardCanvas = document.getElementById('tetris-board');
+    const nextCanvas = document.getElementById('next-piece');
+    const opponentCanvas = document.getElementById('opponent-board');
+    const boardCtx = boardCanvas.getContext('2d');
+    const nextCtx = nextCanvas.getContext('2d');
+    boardCtx.scale(BLOCK, BLOCK);
+    const opponentCtx = opponentCanvas ? opponentCanvas.getContext('2d') : null;
+    const OPPONENT_BLOCK = 20;
+    if (opponentCtx) {
+        opponentCtx.setTransform(1, 0, 0, 1, 0, 0);
+        opponentCtx.scale(OPPONENT_BLOCK, OPPONENT_BLOCK);
+    }
 
+    const ui = {
+        score: document.getElementById('score-value'),
+        lines: document.getElementById('lines-value'),
+        level: document.getElementById('level-value'),
+        speed: document.getElementById('speed-value'),
+        bestInline: document.getElementById('best-score-inline'),
+        elapsedInline: document.getElementById('elapsed-time-inline'),
+        badge: document.getElementById('game-state-badge'),
+        overlay: document.getElementById('board-overlay'),
+        pauseButton: document.getElementById('pause-button'),
+        restartButton: document.getElementById('restart-button'),
+        modalRestartButton: document.getElementById('modal-restart-button'),
+        detailStatus: document.getElementById('detail-status'),
+        detailPieces: document.getElementById('detail-pieces'),
+        detailLines: document.getElementById('detail-lines'),
+        detailDuration: document.getElementById('detail-duration'),
+        finalScore: document.getElementById('final-score'),
+        finalLines: document.getElementById('final-lines'),
+        finalLevel: document.getElementById('final-level'),
+        finalDuration: document.getElementById('final-duration'),
+        historyEmpty: document.getElementById('history-empty'),
+        historyList: document.getElementById('history-list'),
+        historyDetail: document.getElementById('history-detail'),
+        scoreboardStatus: document.getElementById('scoreboard-status'),
+        scoreboardEmpty: document.getElementById('scoreboard-empty'),
+        scoreboardList: document.getElementById('scoreboard-list'),
+        selectedScore: document.getElementById('selected-score'),
+        selectedLevel: document.getElementById('selected-level'),
+        selectedLines: document.getElementById('selected-lines'),
+        selectedDuration: document.getElementById('selected-duration'),
+        selectedFinished: document.getElementById('selected-finished'),
+        toastEl: document.getElementById('game-toast'),
+        toastBody: document.getElementById('toast-body'),
+        toastTimestamp: document.getElementById('toast-timestamp'),
+        playerNameInput: document.getElementById('player-name'),
+        createRoomBtn: document.getElementById('create-room-btn'),
+        joinRoomBtn: document.getElementById('join-room-btn'),
+        leaveRoomBtn: document.getElementById('leave-room-btn'),
+        roomCodeInput: document.getElementById('room-code-input'),
+        roomCodeCard: document.getElementById('room-code-card'),
+        roomCodeValue: document.getElementById('room-code-value'),
+        copyRoomBtn: document.getElementById('copy-room-btn'),
+        roomStatusBadge: document.getElementById('room-status-badge'),
+        roomStatusText: document.getElementById('room-status-text'),
+        opponentName: document.getElementById('opponent-name'),
+        opponentStats: document.getElementById('opponent-stats'),
+        opponentStatus: document.getElementById('opponent-status')
+    };
+
+    const bootstrapToast = window.bootstrap ? bootstrap.Toast.getOrCreateInstance(ui.toastEl, { delay: 2200 }) : null;
+    const gameOverModalEl = document.getElementById('gameOverModal');
+    const gameOverModal = window.bootstrap ? new bootstrap.Modal(gameOverModalEl) : null;
+
+    function safeOn(element, eventName, handler) {
+        if (!element) return;
+        element.addEventListener(eventName, handler);
+    }
+
+    let board = createBoard();
+    let currentPiece = null;
+    let nextQueue = [];
+    let bag = [];
+    let animationFrameId = null;
+    let lastTime = 0;
+    let dropCounter = 0;
+    let dropInterval = 900;
+    let score = 0;
+    let lines = 0;
+    let level = 1;
+    let piecesPlaced = 0;
+    let bestScore = Number(localStorage.getItem(STORAGE_KEYS.best) || 0);
+    let history = loadHistory();
+    let scoreboardEntries = [];
+    let selectedRunId = history[0]?.id || null;
+    let startedAt = null;
+    let endedAt = null;
+    let isRunning = false;
+    let isPaused = false;
+    let isGameOver = false;
+    const multiplayer = {
+        roomCode: null,
+        token: null,
+        slot: null,
+        displayName: '',
+        pollTimer: null,
+        isSyncing: false,
+        opponent: null,
+        roomStatus: 'offline',
+        playerCount: 0
+    };
+
+    function createBoard() {
+        return Array.from({ length: ROWS }, () => Array(COLS).fill(0));
+    }
+
+    function cloneMatrix(matrix) {
+        return matrix.map((row) => row.slice());
+    }
+
+    function shuffle(array) {
+        const clone = array.slice();
+        for (let i = clone.length - 1; i > 0; i -= 1) {
+            const j = Math.floor(Math.random() * (i + 1));
+            [clone[i], clone[j]] = [clone[j], clone[i]];
+        }
+        return clone;
+    }
+
+    function fillQueue() {
+        while (nextQueue.length < 4) {
+            if (bag.length === 0) {
+                bag = shuffle(Object.keys(PIECE_DEFS));
+            }
+            nextQueue.push(bag.pop());
+        }
+    }
+
+    function createPiece(type) {
+        const definition = PIECE_DEFS[type];
+        const matrix = cloneMatrix(definition.matrix);
+        return {
+            type,
+            matrix,
+            x: Math.floor(COLS / 2) - Math.ceil(matrix[0].length / 2),
+            y: 0,
+            color: definition.color
+        };
+    }
+
+    function spawnPiece() {
+        fillQueue();
+        currentPiece = createPiece(nextQueue.shift());
+        fillQueue();
+
+        if (collides(board, currentPiece)) {
+            finishGame();
+        }
+    }
+
+    function collides(targetBoard, piece, moveX = 0, moveY = 0, testMatrix = piece.matrix) {
+        for (let y = 0; y < testMatrix.length; y += 1) {
+            for (let x = 0; x < testMatrix[y].length; x += 1) {
+                if (testMatrix[y][x] === 0) continue;
+                const boardX = x + piece.x + moveX;
+                const boardY = y + piece.y + moveY;
+                if (boardX < 0 || boardX >= COLS || boardY >= ROWS) return true;
+                if (boardY >= 0 && targetBoard[boardY][boardX] !== 0) return true;
+            }
+        }
+        return false;
+    }
+
+    function mergePiece() {
+        currentPiece.matrix.forEach((row, y) => {
+            row.forEach((value, x) => {
+                if (value !== 0 && board[y + currentPiece.y] && board[y + currentPiece.y][x + currentPiece.x] !== undefined) {
+                    board[y + currentPiece.y][x + currentPiece.x] = value;
+                }
+            });
+        });
+    }
+
+    function clearLines() {
+        let cleared = 0;
+        outer: for (let y = ROWS - 1; y >= 0; y -= 1) {
+            for (let x = 0; x < COLS; x += 1) {
+                if (board[y][x] === 0) {
+                    continue outer;
+                }
+            }
+            const row = board.splice(y, 1)[0].fill(0);
+            board.unshift(row);
+            cleared += 1;
+            y += 1;
+        }
+        return cleared;
+    }
+
+    function rotate(matrix, direction) {
+        const rotated = matrix.map((_, index) => matrix.map((row) => row[index]));
+        if (direction > 0) {
+            rotated.forEach((row) => row.reverse());
+        } else {
+            rotated.reverse();
+        }
+        return rotated;
+    }
+
+    function attemptRotate(direction) {
+        if (!currentPiece || isPaused || isGameOver) return;
+        const rotated = rotate(currentPiece.matrix, direction);
+        const offsets = [0, -1, 1, -2, 2];
+        const originalX = currentPiece.x;
+
+        for (const offset of offsets) {
+            if (!collides(board, currentPiece, offset, 0, rotated)) {
+                currentPiece.x += offset;
+                currentPiece.matrix = rotated;
+                draw();
+                return;
+            }
+        }
+        currentPiece.x = originalX;
+    }
+
+    function movePiece(deltaX) {
+        if (!currentPiece || isPaused || isGameOver) return;
+        if (!collides(board, currentPiece, deltaX, 0)) {
+            currentPiece.x += deltaX;
+            draw();
+        }
+    }
+
+    function dropPiece(softDrop = false) {
+        if (!currentPiece || isPaused || isGameOver) return;
+        if (!collides(board, currentPiece, 0, 1)) {
+            currentPiece.y += 1;
+            if (softDrop) score += 1;
+            dropCounter = 0;
+            updateStats();
+            draw();
+            return true;
+        }
+
+        mergePiece();
+        piecesPlaced += 1;
+        const cleared = clearLines();
+        if (cleared > 0) {
+            const lineScores = [0, 100, 300, 500, 800];
+            score += lineScores[cleared] * level;
+            lines += cleared;
+            showToast(cleared === 4 ? 'Tetris! Four lines cleared.' : `${cleared} line${cleared > 1 ? 's' : ''} cleared.`);
+        }
+
+        level = Math.floor(lines / 10) + 1;
+        dropInterval = Math.max(120, 900 - ((level - 1) * 65));
+        spawnPiece();
+        updateStats();
+        draw();
+        return false;
+    }
+
+    function hardDrop() {
+        if (!currentPiece || isPaused || isGameOver) return;
+        let distance = 0;
+        while (!collides(board, currentPiece, 0, 1)) {
+            currentPiece.y += 1;
+            distance += 1;
+        }
+        if (distance > 0) {
+            score += distance * 2;
+        }
+        dropPiece(false);
+    }
+
+    function calculateGhostY() {
+        if (!currentPiece) return 0;
+        let ghostY = currentPiece.y;
+        while (!collides(board, { ...currentPiece, y: ghostY }, 0, 1)) {
+            ghostY += 1;
+        }
+        return ghostY;
+    }
+
+    function drawCell(ctx, x, y, color, alpha = 1) {
+        ctx.save();
+        ctx.globalAlpha = alpha;
+        ctx.fillStyle = color;
+        ctx.fillRect(x + 0.04, y + 0.04, 0.92, 0.92);
+        ctx.strokeStyle = 'rgba(255,255,255,0.15)';
+        ctx.lineWidth = 0.05;
+        ctx.strokeRect(x + 0.06, y + 0.06, 0.88, 0.88);
+        ctx.restore();
+    }
+
+    function drawBoard() {
+        boardCtx.fillStyle = '#0e1218';
+        boardCtx.fillRect(0, 0, COLS, ROWS);
+
+        for (let y = 0; y < ROWS; y += 1) {
+            for (let x = 0; x < COLS; x += 1) {
+                if (board[y][x] !== 0) {
+                    drawCell(boardCtx, x, y, colorLookup[board[y][x]]);
+                }
+            }
+        }
+
+        boardCtx.strokeStyle = 'rgba(255,255,255,0.06)';
+        boardCtx.lineWidth = 0.03;
+        for (let x = 0; x <= COLS; x += 1) {
+            boardCtx.beginPath();
+            boardCtx.moveTo(x, 0);
+            boardCtx.lineTo(x, ROWS);
+            boardCtx.stroke();
+        }
+        for (let y = 0; y <= ROWS; y += 1) {
+            boardCtx.beginPath();
+            boardCtx.moveTo(0, y);
+            boardCtx.lineTo(COLS, y);
+            boardCtx.stroke();
+        }
+    }
+
+    function drawPiece(piece, alpha = 1) {
+        piece.matrix.forEach((row, y) => {
+            row.forEach((value, x) => {
+                if (value !== 0) {
+                    drawCell(boardCtx, x + piece.x, y + piece.y, colorLookup[value], alpha);
+                }
+            });
+        });
+    }
+
+    function drawGhostPiece() {
+        if (!currentPiece) return;
+        const ghostY = calculateGhostY();
+        drawPiece({ ...currentPiece, y: ghostY }, 0.2);
+    }
+
+    function drawNext() {
+        nextCtx.clearRect(0, 0, nextCanvas.width, nextCanvas.height);
+        nextCtx.fillStyle = '#0e1218';
+        nextCtx.fillRect(0, 0, nextCanvas.width, nextCanvas.height);
+
+        const previewType = nextQueue[0];
+        if (!previewType) return;
+        const matrix = PIECE_DEFS[previewType].matrix;
+        const cell = 28;
+        const width = matrix[0].length * cell;
+        const height = matrix.length * cell;
+        const offsetX = (nextCanvas.width - width) / 2;
+        const offsetY = (nextCanvas.height - height) / 2;
+
+        matrix.forEach((row, y) => {
+            row.forEach((value, x) => {
+                if (value !== 0) {
+                    nextCtx.fillStyle = colorLookup[value];
+                    nextCtx.fillRect(offsetX + (x * cell) + 2, offsetY + (y * cell) + 2, cell - 4, cell - 4);
+                    nextCtx.strokeStyle = 'rgba(255,255,255,0.15)';
+                    nextCtx.strokeRect(offsetX + (x * cell) + 2, offsetY + (y * cell) + 2, cell - 4, cell - 4);
+                }
+            });
+        });
+    }
+
+    function formatDuration(ms) {
+        const totalSeconds = Math.max(0, Math.floor(ms / 1000));
+        const minutes = String(Math.floor(totalSeconds / 60)).padStart(2, '0');
+        const seconds = String(totalSeconds % 60).padStart(2, '0');
+        return `${minutes}:${seconds}`;
+    }
+
+    function getElapsedMs() {
+        if (!startedAt) return 0;
+        if (endedAt) return endedAt - startedAt;
+        return Date.now() - startedAt;
+    }
+
+    function updateStats() {
+        ui.score.textContent = score.toLocaleString();
+        ui.lines.textContent = lines.toString();
+        ui.level.textContent = level.toString();
+        ui.speed.textContent = `${(dropInterval / 1000).toFixed(2)}s`;
+        ui.bestInline.textContent = bestScore.toLocaleString();
+        ui.elapsedInline.textContent = formatDuration(getElapsedMs());
+        ui.detailPieces.textContent = piecesPlaced.toString();
+        ui.detailLines.textContent = lines.toString();
+        ui.detailDuration.textContent = formatDuration(getElapsedMs());
+        ui.detailStatus.textContent = isGameOver ? 'Game over' : (isPaused ? 'Paused' : (isRunning ? 'In progress' : 'Ready to start'));
+        drawNext();
+    }
+
+    function getGameStatus() {
+        if (isGameOver) return 'game_over';
+        if (isPaused) return 'paused';
+        if (isRunning) return 'playing';
+        return 'ready';
+    }
+
+    function getComposedBoard() {
+        const composed = board.map((row) => row.slice());
+        if (currentPiece) {
+            currentPiece.matrix.forEach((row, y) => {
+                row.forEach((value, x) => {
+                    if (value === 0) return;
+                    const boardY = y + currentPiece.y;
+                    const boardX = x + currentPiece.x;
+                    if (boardY < 0 || boardY >= ROWS || boardX < 0 || boardX >= COLS) return;
+                    composed[boardY][boardX] = value;
+                });
+            });
+        }
+        return composed;
+    }
+
+    function drawOpponentBoard(boardState) {
+        if (!opponentCtx) return;
+        opponentCtx.fillStyle = '#0e1218';
+        opponentCtx.fillRect(0, 0, COLS, ROWS);
+
+        if (Array.isArray(boardState)) {
+            for (let y = 0; y < ROWS; y += 1) {
+                for (let x = 0; x < COLS; x += 1) {
+                    if (boardState[y] && boardState[y][x]) {
+                        drawCell(opponentCtx, x, y, colorLookup[boardState[y][x]]);
+                    }
+                }
+            }
+        }
+
+        opponentCtx.strokeStyle = 'rgba(255,255,255,0.06)';
+        opponentCtx.lineWidth = 0.03;
+        for (let x = 0; x <= COLS; x += 1) {
+            opponentCtx.beginPath();
+            opponentCtx.moveTo(x, 0);
+            opponentCtx.lineTo(x, ROWS);
+            opponentCtx.stroke();
+        }
+        for (let y = 0; y <= ROWS; y += 1) {
+            opponentCtx.beginPath();
+            opponentCtx.moveTo(0, y);
+            opponentCtx.lineTo(COLS, y);
+            opponentCtx.stroke();
+        }
+    }
+
+    function setBadge(label, variant = 'ready') {
+        ui.badge.className = `badge status-badge state-${variant}`;
+        ui.badge.textContent = label;
+    }
+
+    function showOverlay(title, copy, label = 'Press Enter to start') {
+        ui.overlay.innerHTML = `
+            <div>
+                <p class="overlay-label mb-2">${label}</p>
+                <h3 class="overlay-title mb-3">${title}</h3>
+                <p class="overlay-copy mb-0">${copy}</p>
+            </div>
+        `;
+        ui.overlay.classList.remove('hidden');
+    }
+
+    function hideOverlay() {
+        ui.overlay.classList.add('hidden');
+    }
+
+    function showToast(message) {
+        ui.toastBody.textContent = message;
+        ui.toastTimestamp.textContent = new Date().toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
+        if (bootstrapToast) bootstrapToast.show();
+    }
+
+    function loadHistory() {
         try {
-            const response = await fetch('api/chat.php', {
+            const parsed = JSON.parse(localStorage.getItem(STORAGE_KEYS.history) || '[]');
+            return Array.isArray(parsed) ? parsed : [];
+        } catch (error) {
+            return [];
+        }
+    }
+
+    function saveHistory(run) {
+        history = [run, ...history].slice(0, 8);
+        localStorage.setItem(STORAGE_KEYS.history, JSON.stringify(history));
+        if (run.score > bestScore) {
+            bestScore = run.score;
+            localStorage.setItem(STORAGE_KEYS.best, String(bestScore));
+            showToast('New best score saved locally.');
+        }
+        selectedRunId = run.id;
+        renderHistory();
+    }
+
+    function renderHistory() {
+        ui.historyList.innerHTML = '';
+        ui.historyEmpty.classList.toggle('d-none', history.length > 0);
+
+        history.forEach((run) => {
+            const button = document.createElement('button');
+            button.type = 'button';
+            button.className = `history-item${selectedRunId === run.id ? ' active' : ''}`;
+            button.innerHTML = `
+                <div class="history-topline">
+                    <span class="history-score">${run.score.toLocaleString()} pts</span>
+                    <span class="history-date">${new Date(run.finishedAt).toLocaleDateString()}</span>
+                </div>
+                <div class="history-subline mt-2">
+                    <span class="history-meta">Level ${run.level} · ${run.lines} line${run.lines === 1 ? '' : 's'}</span>
+                    <span class="history-meta">${run.duration}</span>
+                </div>
+            `;
+            button.addEventListener('click', () => {
+                selectedRunId = run.id;
+                renderHistory();
+            });
+            ui.historyList.appendChild(button);
+        });
+
+        const selectedRun = history.find((item) => item.id === selectedRunId) || history[0] || null;
+        if (selectedRun) {
+            ui.historyDetail.classList.remove('d-none');
+            ui.selectedScore.textContent = selectedRun.score.toLocaleString();
+            ui.selectedLevel.textContent = String(selectedRun.level);
+            ui.selectedLines.textContent = String(selectedRun.lines);
+            ui.selectedDuration.textContent = selectedRun.duration;
+            ui.selectedFinished.textContent = new Date(selectedRun.finishedAt).toLocaleString();
+        } else {
+            ui.historyDetail.classList.add('d-none');
+        }
+    }
+
+
+    function getPreferredPlayerName() {
+        const typedName = (ui.playerNameInput?.value || '').trim();
+        if (typedName) return typedName;
+        if (multiplayer.displayName) return multiplayer.displayName;
+        return 'Player';
+    }
+
+    function formatDurationFromSeconds(totalSeconds) {
+        const safe = Math.max(0, Number(totalSeconds) || 0);
+        const minutes = Math.floor(safe / 60);
+        const seconds = safe % 60;
+        return `${String(minutes).padStart(2, '0')}:${String(seconds).padStart(2, '0')}`;
+    }
+
+    function renderScoreboard() {
+        if (!ui.scoreboardList || !ui.scoreboardEmpty || !ui.scoreboardStatus) return;
+
+        const hasEntries = scoreboardEntries.length > 0;
+        ui.scoreboardEmpty.classList.toggle('d-none', hasEntries);
+        ui.scoreboardList.innerHTML = '';
+
+        if (!hasEntries) {
+            ui.scoreboardStatus.textContent = 'Waiting for scores';
+            return;
+        }
+
+        ui.scoreboardStatus.textContent = `Top ${scoreboardEntries.length}`;
+
+        scoreboardEntries.forEach((entry, index) => {
+            const item = document.createElement('article');
+            item.className = 'scoreboard-item';
+
+            const rank = document.createElement('div');
+            rank.className = 'scoreboard-rank';
+            rank.textContent = `#${index + 1}`;
+
+            const body = document.createElement('div');
+            body.className = 'scoreboard-item-body';
+
+            const topRow = document.createElement('div');
+            topRow.className = 'scoreboard-topline';
+
+            const name = document.createElement('strong');
+            name.className = 'scoreboard-name';
+            name.textContent = entry.player_name || 'Player';
+
+            const scoreValue = document.createElement('span');
+            scoreValue.className = 'scoreboard-score';
+            scoreValue.textContent = `${Number(entry.score || 0).toLocaleString()} pts`;
+
+            topRow.appendChild(name);
+            topRow.appendChild(scoreValue);
+
+            const meta = document.createElement('div');
+            meta.className = 'scoreboard-meta';
+            const linesLabel = Number(entry.lines || 0) === 1 ? 'line' : 'lines';
+            const dateValue = entry.created_at ? new Date(String(entry.created_at).replace(' ', 'T') + 'Z') : null;
+            const dateLabel = dateValue && !Number.isNaN(dateValue.getTime()) ? dateValue.toLocaleDateString() : 'Today';
+            const modeLabel = entry.mode === 'multiplayer' ? 'Multiplayer' : 'Solo';
+            meta.textContent = `Level ${entry.level} · ${entry.lines} ${linesLabel} · ${formatDurationFromSeconds(entry.duration_seconds)} · ${modeLabel} · ${dateLabel}`;
+
+            body.appendChild(topRow);
+            body.appendChild(meta);
+            item.appendChild(rank);
+            item.appendChild(body);
+            ui.scoreboardList.appendChild(item);
+        });
+    }
+
+    async function loadScoreboard() {
+        if (!ui.scoreboardStatus) return;
+        ui.scoreboardStatus.textContent = 'Loading…';
+        const controller = new AbortController();
+        const timeoutId = window.setTimeout(() => controller.abort(), SCOREBOARD_TIMEOUT_MS);
+        try {
+            const response = await fetch(`${SCOREBOARD_API_URL}?limit=10`, {
+                cache: 'no-store',
+                signal: controller.signal
+            });
+            const payload = await response.json();
+            if (!response.ok || !payload.success) {
+                throw new Error(payload.error || 'Unable to load scoreboard.');
+            }
+            scoreboardEntries = Array.isArray(payload.scores) ? payload.scores : [];
+            renderScoreboard();
+        } catch (error) {
+            console.warn('Scoreboard load error', error);
+            scoreboardEntries = [];
+            renderScoreboard();
+            ui.scoreboardStatus.textContent = 'Offline';
+        } finally {
+            window.clearTimeout(timeoutId);
+        }
+    }
+
+    async function saveScoreToDatabase(run) {
+        try {
+            const response = await fetch(SCOREBOARD_API_URL, {
                 method: 'POST',
                 headers: { 'Content-Type': 'application/json' },
-                body: JSON.stringify({ message })
+                body: JSON.stringify({
+                    action: 'save_score',
+                    player_name: getPreferredPlayerName(),
+                    score: run.score,
+                    lines: run.lines,
+                    level: run.level,
+                    pieces_placed: run.piecesPlaced,
+                    duration_seconds: run.durationSeconds,
+                    room_code: multiplayer.roomCode || null
+                })
             });
-            const data = await response.json();
-            
-            // Artificial delay for realism
-            setTimeout(() => {
-                appendMessage(data.reply, 'bot');
-            }, 500);
+            const payload = await response.json();
+            if (!response.ok || !payload.success) {
+                throw new Error(payload.error || 'Unable to save scoreboard entry.');
+            }
+            await loadScoreboard();
+            if (payload.placement) {
+                showToast(`Run saved to the database scoreboard. Rank #${payload.placement}.`);
+            } else {
+                showToast('Run saved to the database scoreboard.');
+            }
         } catch (error) {
-            console.error('Error:', error);
-            appendMessage("Sorry, something went wrong. Please try again.", 'bot');
+            console.warn('Scoreboard save error', error);
+            showToast('Run saved locally. Database scoreboard was unavailable.');
+            if (ui.scoreboardStatus) {
+                ui.scoreboardStatus.textContent = 'Offline';
+            }
+        }
+    }
+
+    function setRoomBadge(label, variant) {
+        ui.roomStatusBadge.className = `badge status-badge state-${variant}`;
+        ui.roomStatusBadge.textContent = label;
+    }
+
+    function updateOpponentUI(opponent) {
+        if (!opponent) {
+            ui.opponentName.textContent = 'Waiting for opponent…';
+            ui.opponentStats.textContent = 'Score — · Level — · Lines —';
+            ui.opponentStatus.textContent = 'Room idle';
+            drawOpponentBoard(null);
+            return;
+        }
+
+        ui.opponentName.textContent = opponent.display_name || 'Opponent';
+        ui.opponentStats.textContent = `Score ${opponent.score.toLocaleString()} · Level ${opponent.level} · Lines ${opponent.lines}`;
+        ui.opponentStatus.textContent = opponent.game_status === 'playing'
+            ? 'In play'
+            : (opponent.game_status === 'paused' ? 'Paused' : (opponent.game_status === 'game_over' ? 'Game over' : 'Ready'));
+        drawOpponentBoard(opponent.board);
+    }
+
+    function updateMultiplayerUI() {
+        const connected = Boolean(multiplayer.roomCode && multiplayer.token);
+        ui.leaveRoomBtn.classList.toggle('d-none', !connected);
+        ui.createRoomBtn.disabled = connected;
+        ui.joinRoomBtn.disabled = connected;
+        ui.roomCodeInput.disabled = connected;
+        ui.roomCodeCard.classList.toggle('d-none', !connected);
+        if (connected) {
+            ui.roomCodeValue.textContent = multiplayer.roomCode;
+        } else {
+            ui.roomCodeValue.textContent = '—';
+        }
+
+        if (!connected) {
+            setRoomBadge('Offline', 'ready');
+            ui.roomStatusText.textContent = 'Create a room to start.';
+            updateOpponentUI(null);
+            return;
+        }
+
+        if (multiplayer.playerCount < 2) {
+            setRoomBadge('Waiting', 'paused');
+            ui.roomStatusText.textContent = 'Share the code so a friend can join.';
+        } else {
+            setRoomBadge('Live', 'playing');
+            ui.roomStatusText.textContent = 'Opponent connected.';
+        }
+    }
+
+    function saveMultiplayerSession(roomCode, token, displayName, slot) {
+        multiplayer.roomCode = roomCode;
+        multiplayer.token = token;
+        multiplayer.displayName = displayName;
+        multiplayer.slot = slot;
+        sessionStorage.setItem(MULTI_STORAGE_KEYS.room, roomCode);
+        sessionStorage.setItem(MULTI_STORAGE_KEYS.token, token);
+        sessionStorage.setItem(MULTI_STORAGE_KEYS.name, displayName);
+        sessionStorage.setItem(MULTI_STORAGE_KEYS.slot, String(slot));
+        updateMultiplayerUI();
+    }
+
+    function clearMultiplayerSession() {
+        multiplayer.roomCode = null;
+        multiplayer.token = null;
+        multiplayer.displayName = '';
+        multiplayer.slot = null;
+        multiplayer.playerCount = 0;
+        multiplayer.opponent = null;
+        sessionStorage.removeItem(MULTI_STORAGE_KEYS.room);
+        sessionStorage.removeItem(MULTI_STORAGE_KEYS.token);
+        sessionStorage.removeItem(MULTI_STORAGE_KEYS.name);
+        sessionStorage.removeItem(MULTI_STORAGE_KEYS.slot);
+        stopMultiplayerLoop();
+        updateMultiplayerUI();
+    }
+
+    async function postMultiplayer(action, data) {
+        const response = await fetch(MULTI_API_URL, {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ action, ...data })
+        });
+        const payload = await response.json();
+        if (!response.ok || !payload.success) {
+            throw new Error(payload.error || 'Multiplayer request failed.');
+        }
+        return payload;
+    }
+
+    async function syncMultiplayer() {
+        if (!multiplayer.roomCode || !multiplayer.token || multiplayer.isSyncing) return;
+        multiplayer.isSyncing = true;
+        try {
+            await postMultiplayer('update_state', {
+                room_code: multiplayer.roomCode,
+                player_token: multiplayer.token,
+                board: getComposedBoard(),
+                piece: currentPiece ? { type: currentPiece.type } : null,
+                meta: { piecesPlaced, updatedAt: Date.now() },
+                score,
+                lines,
+                level,
+                game_status: getGameStatus()
+            });
+
+            const state = await postMultiplayer('get_state', {
+                room_code: multiplayer.roomCode,
+                player_token: multiplayer.token
+            });
+
+            multiplayer.playerCount = state.room?.player_count || 0;
+            multiplayer.opponent = (state.players || []).find((player) => !player.is_self) || null;
+            updateOpponentUI(multiplayer.opponent);
+            updateMultiplayerUI();
+        } catch (error) {
+            console.warn('Multiplayer sync error', error);
+            ui.roomStatusText.textContent = 'Connection lost. Try rejoining.';
+            setRoomBadge('Error', 'game-over');
+        } finally {
+            multiplayer.isSyncing = false;
+        }
+    }
+
+    function startMultiplayerLoop() {
+        stopMultiplayerLoop();
+        syncMultiplayer();
+        multiplayer.pollTimer = window.setInterval(syncMultiplayer, MULTI_POLL_INTERVAL);
+    }
+
+    function stopMultiplayerLoop() {
+        if (multiplayer.pollTimer) {
+            clearInterval(multiplayer.pollTimer);
+            multiplayer.pollTimer = null;
+        }
+    }
+
+    function resetState() {
+        board = createBoard();
+        nextQueue = [];
+        bag = [];
+        score = 0;
+        lines = 0;
+        level = 1;
+        piecesPlaced = 0;
+        dropInterval = 900;
+        dropCounter = 0;
+        lastTime = 0;
+        startedAt = Date.now();
+        endedAt = null;
+        isRunning = true;
+        isPaused = false;
+        isGameOver = false;
+        fillQueue();
+        spawnPiece();
+        hideOverlay();
+        setBadge('Playing', 'playing');
+        ui.pauseButton.textContent = 'Pause';
+        updateStats();
+        draw();
+    }
+
+    function startGame() {
+        if (gameOverModal) gameOverModal.hide();
+        resetState();
+        showToast('Game started. Good luck.');
+        syncMultiplayer();
+    }
+
+    function pauseGame(showNotice = true) {
+        if (!isRunning || isGameOver) return;
+        isPaused = !isPaused;
+        setBadge(isPaused ? 'Paused' : 'Playing', isPaused ? 'paused' : 'playing');
+        ui.pauseButton.textContent = isPaused ? 'Resume' : 'Pause';
+        ui.detailStatus.textContent = isPaused ? 'Paused' : 'In progress';
+        if (isPaused) {
+            showOverlay('Paused', 'Press P to resume, or restart for a clean board.', 'Game paused');
+        } else {
+            hideOverlay();
+        }
+        if (showNotice) showToast(isPaused ? 'Game paused.' : 'Back in play.');
+        syncMultiplayer();
+    }
+
+    function finishGame() {
+        endedAt = Date.now();
+        isGameOver = true;
+        isRunning = false;
+        isPaused = false;
+        setBadge('Game over', 'game-over');
+        ui.pauseButton.textContent = 'Pause';
+        showOverlay('Run complete', 'Restart to jump into a fresh round. This run was saved locally and is being submitted to the scoreboard.', 'Game over');
+
+        const elapsedMs = getElapsedMs();
+        const run = {
+            id: `${Date.now()}`,
+            score,
+            lines,
+            level,
+            piecesPlaced,
+            duration: formatDuration(elapsedMs),
+            durationSeconds: Math.max(0, Math.round(elapsedMs / 1000)),
+            finishedAt: endedAt
+        };
+        saveHistory(run);
+
+        ui.finalScore.textContent = score.toLocaleString();
+        ui.finalLines.textContent = lines.toString();
+        ui.finalLevel.textContent = level.toString();
+        ui.finalDuration.textContent = run.duration;
+        updateStats();
+        draw();
+        showToast('Game over. Run saved locally.');
+        if (gameOverModal) gameOverModal.show();
+        void saveScoreToDatabase(run);
+        syncMultiplayer();
+    }
+
+    function draw() {
+        drawBoard();
+        if (currentPiece && !isGameOver) {
+            drawGhostPiece();
+            drawPiece(currentPiece);
+        } else if (currentPiece && isGameOver) {
+            drawPiece(currentPiece, 0.8);
+        }
+    }
+
+    function update(time = 0) {
+        const deltaTime = time - lastTime;
+        lastTime = time;
+
+        if (isRunning && !isPaused && !isGameOver) {
+            dropCounter += deltaTime;
+            if (dropCounter > dropInterval) {
+                dropPiece(false);
+            }
+        }
+
+        updateStats();
+        draw();
+        animationFrameId = requestAnimationFrame(update);
+    }
+
+    function handleKeydown(event) {
+        const code = event.code;
+        const gameKeys = ['ArrowLeft', 'ArrowRight', 'ArrowDown', 'ArrowUp', 'KeyX', 'KeyZ', 'Space', 'KeyP', 'KeyR', 'Enter'];
+        if (gameKeys.includes(code)) {
+            event.preventDefault();
+        }
+
+        if ((code === 'Enter' && !isRunning) || (code === 'KeyR')) {
+            startGame();
+            return;
+        }
+
+        if (!isRunning || isGameOver) {
+            return;
+        }
+
+        switch (code) {
+            case 'ArrowLeft':
+                movePiece(-1);
+                break;
+            case 'ArrowRight':
+                movePiece(1);
+                break;
+            case 'ArrowDown':
+                dropPiece(true);
+                break;
+            case 'ArrowUp':
+            case 'KeyX':
+                attemptRotate(1);
+                break;
+            case 'KeyZ':
+                attemptRotate(-1);
+                break;
+            case 'Space':
+                hardDrop();
+                break;
+            case 'KeyP':
+                pauseGame(true);
+                break;
+            default:
+                break;
+        }
+    }
+
+    safeOn(ui.playerNameInput, 'change', () => {
+        const name = (ui.playerNameInput.value || '').trim();
+        if (name) {
+            sessionStorage.setItem(MULTI_STORAGE_KEYS.name, name);
         }
     });
+
+    safeOn(ui.createRoomBtn, 'click', async () => {
+        if (multiplayer.roomCode) return;
+        const displayName = (ui.playerNameInput.value || '').trim() || 'Player 1';
+        try {
+            const result = await postMultiplayer('create_room', { display_name: displayName });
+            saveMultiplayerSession(result.room.code, result.self.token, result.self.display_name, result.self.slot);
+            startMultiplayerLoop();
+            showToast(`Room ${result.room.code} created. Share the code.`);
+        } catch (error) {
+            showToast(error.message || 'Unable to create room.');
+        }
+    });
+
+    safeOn(ui.joinRoomBtn, 'click', async () => {
+        if (multiplayer.roomCode) return;
+        const roomCode = (ui.roomCodeInput.value || '').trim();
+        if (!roomCode) {
+            showToast('Enter a room code to join.');
+            return;
+        }
+        const displayName = (ui.playerNameInput.value || '').trim() || 'Player 2';
+        try {
+            const result = await postMultiplayer('join_room', { room_code: roomCode, display_name: displayName });
+            saveMultiplayerSession(result.room.code, result.self.token, result.self.display_name, result.self.slot);
+            startMultiplayerLoop();
+            showToast(`Joined room ${result.room.code}.`);
+        } catch (error) {
+            showToast(error.message || 'Unable to join room.');
+        }
+    });
+
+    safeOn(ui.leaveRoomBtn, 'click', async () => {
+        if (!multiplayer.roomCode || !multiplayer.token) return;
+        try {
+            await postMultiplayer('leave_room', { room_code: multiplayer.roomCode, player_token: multiplayer.token });
+        } catch (error) {
+            console.warn('Leave room error', error);
+        } finally {
+            clearMultiplayerSession();
+            showToast('Left the room.');
+        }
+    });
+
+    safeOn(ui.copyRoomBtn, 'click', async () => {
+        if (!multiplayer.roomCode) return;
+        try {
+            await navigator.clipboard.writeText(multiplayer.roomCode);
+            showToast('Room code copied.');
+        } catch (error) {
+            showToast('Copy failed. Select and copy the code manually.');
+        }
+    });
+
+    safeOn(ui.pauseButton, 'click', () => {
+        if (!isRunning || isGameOver) {
+            showToast('Start a run before using pause.');
+            return;
+        }
+        pauseGame(true);
+    });
+
+    safeOn(ui.restartButton, 'click', startGame);
+    safeOn(ui.modalRestartButton, 'click', startGame);
+    document.addEventListener('keydown', handleKeydown);
+    if (gameOverModalEl) {
+        gameOverModalEl.addEventListener('hidden.bs.modal', () => {
+            if (isGameOver) {
+                boardCanvas.focus?.();
+            }
+        });
+    }
+
+    const savedName = sessionStorage.getItem(MULTI_STORAGE_KEYS.name);
+    if (savedName && ui.playerNameInput) {
+        ui.playerNameInput.value = savedName;
+    }
+    const savedRoom = sessionStorage.getItem(MULTI_STORAGE_KEYS.room);
+    const savedToken = sessionStorage.getItem(MULTI_STORAGE_KEYS.token);
+    const savedSlot = sessionStorage.getItem(MULTI_STORAGE_KEYS.slot);
+    if (savedRoom && savedToken) {
+        saveMultiplayerSession(savedRoom, savedToken, savedName || 'Player', Number(savedSlot || 0));
+        startMultiplayerLoop();
+    }
+
+    renderHistory();
+    void loadScoreboard();
+    updateStats();
+    updateMultiplayerUI();
+    showOverlay('Stack clean. Clear fast.', 'Use the keyboard to play a faithful Tetris loop with local history and a database scoreboard.', 'Press Enter to start');
+    setBadge('Ready', 'ready');
+    update();
 });
diff --git a/db/migrate.php b/db/migrate.php
new file mode 100644
index 0000000..bbbbd89
--- /dev/null
+++ b/db/migrate.php
@@ -0,0 +1,51 @@
+<?php
+declare(strict_types=1);
+
+require_once __DIR__ . '/config.php';
+
+function run_migrations(): void
+{
+    static $hasRun = false;
+
+    if ($hasRun) {
+        return;
+    }
+
+    $hasRun = true;
+    $pdo = db();
+
+    $pdo->exec(
+        "CREATE TABLE IF NOT EXISTS schema_migrations (
+"
+        . "    filename VARCHAR(190) NOT NULL PRIMARY KEY,
+"
+        . "    applied_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+"
+        . ") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci"
+    );
+
+    $files = glob(__DIR__ . '/migrations/*.sql') ?: [];
+    sort($files, SORT_STRING);
+
+    $checkStmt = $pdo->prepare('SELECT 1 FROM schema_migrations WHERE filename = :filename LIMIT 1');
+    $insertStmt = $pdo->prepare('INSERT INTO schema_migrations (filename) VALUES (:filename)');
+
+    foreach ($files as $file) {
+        $filename = basename($file);
+        $checkStmt->bindValue(':filename', $filename, PDO::PARAM_STR);
+        $checkStmt->execute();
+
+        if ($checkStmt->fetchColumn()) {
+            continue;
+        }
+
+        $sql = trim((string) file_get_contents($file));
+
+        if ($sql !== '') {
+            $pdo->exec($sql);
+        }
+
+        $insertStmt->bindValue(':filename', $filename, PDO::PARAM_STR);
+        $insertStmt->execute();
+    }
+}
diff --git a/db/migrations/20260325_tetris_multiplayer_rooms.sql b/db/migrations/20260325_tetris_multiplayer_rooms.sql
new file mode 100644
index 0000000..4f4f130
--- /dev/null
+++ b/db/migrations/20260325_tetris_multiplayer_rooms.sql
@@ -0,0 +1,41 @@
+-- Multiplayer room support for the browser Tetris game.
+CREATE TABLE IF NOT EXISTS tetris_rooms (
+    id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
+    room_code VARCHAR(8) NOT NULL,
+    status ENUM('waiting', 'active', 'closed') NOT NULL DEFAULT 'waiting',
+    host_player_id BIGINT UNSIGNED NULL,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    expires_at DATETIME NULL,
+    PRIMARY KEY (id),
+    UNIQUE KEY uniq_tetris_rooms_code (room_code),
+    KEY idx_tetris_rooms_status (status),
+    KEY idx_tetris_rooms_updated (updated_at)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE IF NOT EXISTS tetris_room_players (
+    id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
+    room_id BIGINT UNSIGNED NOT NULL,
+    player_token CHAR(48) NOT NULL,
+    player_slot TINYINT UNSIGNED NOT NULL,
+    display_name VARCHAR(48) NOT NULL DEFAULT 'Player',
+    connection_status ENUM('connected', 'disconnected') NOT NULL DEFAULT 'connected',
+    game_status ENUM('ready', 'playing', 'paused', 'game_over') NOT NULL DEFAULT 'ready',
+    score INT UNSIGNED NOT NULL DEFAULT 0,
+    lines_cleared INT UNSIGNED NOT NULL DEFAULT 0,
+    level INT UNSIGNED NOT NULL DEFAULT 1,
+    board_state_json JSON NULL,
+    piece_state_json JSON NULL,
+    meta_json JSON NULL,
+    joined_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    last_seen_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    PRIMARY KEY (id),
+    UNIQUE KEY uniq_tetris_room_players_token (player_token),
+    UNIQUE KEY uniq_tetris_room_players_slot (room_id, player_slot),
+    KEY idx_tetris_room_players_room (room_id),
+    KEY idx_tetris_room_players_seen (last_seen_at),
+    CONSTRAINT fk_tetris_room_players_room
+        FOREIGN KEY (room_id) REFERENCES tetris_rooms(id)
+        ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
diff --git a/db/migrations/20260325_tetris_scoreboard.sql b/db/migrations/20260325_tetris_scoreboard.sql
new file mode 100644
index 0000000..2bc22d2
--- /dev/null
+++ b/db/migrations/20260325_tetris_scoreboard.sql
@@ -0,0 +1,18 @@
+-- Persistent scoreboard entries for completed Tetris runs.
+CREATE TABLE IF NOT EXISTS tetris_scores (
+    id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
+    player_name VARCHAR(48) NOT NULL DEFAULT 'Player',
+    score INT UNSIGNED NOT NULL DEFAULT 0,
+    lines_cleared INT UNSIGNED NOT NULL DEFAULT 0,
+    level INT UNSIGNED NOT NULL DEFAULT 1,
+    pieces_placed INT UNSIGNED NOT NULL DEFAULT 0,
+    duration_seconds INT UNSIGNED NOT NULL DEFAULT 0,
+    mode ENUM('solo', 'multiplayer') NOT NULL DEFAULT 'solo',
+    room_code VARCHAR(8) NULL,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    PRIMARY KEY (id),
+    KEY idx_tetris_scores_rank (score, lines_cleared, level, duration_seconds),
+    KEY idx_tetris_scores_created (created_at),
+    KEY idx_tetris_scores_mode (mode)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
diff --git a/index.php b/index.php
index 7205f3d..1fb5c8d 100644
--- a/index.php
+++ b/index.php
@@ -1,150 +1,299 @@
 <?php
 declare(strict_types=1);
-@ini_set('display_errors', '1');
-@error_reporting(E_ALL);
 @date_default_timezone_set('UTC');
 
-$phpVersion = PHP_VERSION;
-$now = date('Y-m-d H:i:s');
+$projectName = trim((string)($_SERVER['PROJECT_NAME'] ?? ''));
+$projectDescription = trim((string)($_SERVER['PROJECT_DESCRIPTION'] ?? ''));
+$projectImageUrl = trim((string)($_SERVER['PROJECT_IMAGE_URL'] ?? ''));
+
+$appName = $projectName !== '' ? $projectName : 'Classic Tetris';
+$pageTitle = $appName . ' — Classic Tetris';
+$metaDescription = $projectDescription !== ''
+    ? $projectDescription
+    : 'Play a focused browser-based Tetris clone with keyboard controls, scoring, levels, next piece preview, pause, restart, and local best score tracking.';
+
+$cssVersion = (string)@filemtime(__DIR__ . '/assets/css/custom.css');
+$jsVersion = (string)@filemtime(__DIR__ . '/assets/js/main.js');
 ?>
 <!doctype html>
 <html lang="en">
 <head>
-  <meta charset="utf-8" />
-  <meta name="viewport" content="width=device-width, initial-scale=1" />
-  <title>New Style</title>
-<?php
-// Read project preview data from environment
-$projectDescription = $_SERVER['PROJECT_DESCRIPTION'] ?? '';
-$projectImageUrl = $_SERVER['PROJECT_IMAGE_URL'] ?? '';
-?>
-<?php if ($projectDescription): ?>
-  <!-- Meta description -->
-  <meta name="description" content='<?= htmlspecialchars($projectDescription) ?>' />
-  <!-- Open Graph meta tags -->
-  <meta property="og:description" content="<?= htmlspecialchars($projectDescription) ?>" />
-  <!-- Twitter meta tags -->
-  <meta property="twitter:description" content="<?= htmlspecialchars($projectDescription) ?>" />
-<?php endif; ?>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title><?= htmlspecialchars($pageTitle) ?></title>
+  <meta name="description" content="<?= htmlspecialchars($metaDescription) ?>">
+  <meta name="author" content="Flatlogic">
+  <meta property="og:title" content="<?= htmlspecialchars($pageTitle) ?>">
+  <meta property="og:description" content="<?= htmlspecialchars($metaDescription) ?>">
+  <meta property="twitter:title" content="<?= htmlspecialchars($pageTitle) ?>">
+  <meta property="twitter:description" content="<?= htmlspecialchars($metaDescription) ?>">
+
 <?php if ($projectImageUrl): ?>
-  <!-- Open Graph image -->
   <meta property="og:image" content="<?= htmlspecialchars($projectImageUrl) ?>" />
-  <!-- Twitter image -->
   <meta property="twitter:image" content="<?= htmlspecialchars($projectImageUrl) ?>" />
 <?php endif; ?>
-  <link rel="preconnect" href="https://fonts.googleapis.com">
-  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
-  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;700&display=swap" rel="stylesheet">
-  <style>
-    :root {
-      --bg-color-start: #6a11cb;
-      --bg-color-end: #2575fc;
-      --text-color: #ffffff;
-      --card-bg-color: rgba(255, 255, 255, 0.01);
-      --card-border-color: rgba(255, 255, 255, 0.1);
-    }
-    body {
-      margin: 0;
-      font-family: 'Inter', sans-serif;
-      background: linear-gradient(45deg, var(--bg-color-start), var(--bg-color-end));
-      color: var(--text-color);
-      display: flex;
-      justify-content: center;
-      align-items: center;
-      min-height: 100vh;
-      text-align: center;
-      overflow: hidden;
-      position: relative;
-    }
-    body::before {
-      content: '';
-      position: absolute;
-      top: 0;
-      left: 0;
-      width: 100%;
-      height: 100%;
-      background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><path d="M-10 10L110 10M10 -10L10 110" stroke-width="1" stroke="rgba(255,255,255,0.05)"/></svg>');
-      animation: bg-pan 20s linear infinite;
-      z-index: -1;
-    }
-    @keyframes bg-pan {
-      0% { background-position: 0% 0%; }
-      100% { background-position: 100% 100%; }
-    }
-    main {
-      padding: 2rem;
-    }
-    .card {
-      background: var(--card-bg-color);
-      border: 1px solid var(--card-border-color);
-      border-radius: 16px;
-      padding: 2rem;
-      backdrop-filter: blur(20px);
-      -webkit-backdrop-filter: blur(20px);
-      box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);
-    }
-    .loader {
-      margin: 1.25rem auto 1.25rem;
-      width: 48px;
-      height: 48px;
-      border: 3px solid rgba(255, 255, 255, 0.25);
-      border-top-color: #fff;
-      border-radius: 50%;
-      animation: spin 1s linear infinite;
-    }
-    @keyframes spin {
-      from { transform: rotate(0deg); }
-      to   { transform: rotate(360deg); }
-    }
-    .hint {
-      opacity: 0.9;
-    }
-    .sr-only {
-      position: absolute;
-      width: 1px; height: 1px;
-      padding: 0; margin: -1px;
-      overflow: hidden;
-      clip: rect(0, 0, 0, 0);
-      white-space: nowrap; border: 0;
-    }
-    h1 {
-      font-size: 3rem;
-      font-weight: 700;
-      margin: 0 0 1rem;
-      letter-spacing: -1px;
-    }
-    p {
-      margin: 0.5rem 0;
-      font-size: 1.1rem;
-    }
-    code {
-      background: rgba(0,0,0,0.2);
-      padding: 2px 6px;
-      border-radius: 4px;
-      font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
-    }
-    footer {
-      position: absolute;
-      bottom: 1rem;
-      font-size: 0.8rem;
-      opacity: 0.7;
-    }
-  </style>
+  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
+  <link rel="stylesheet" href="assets/css/custom.css?v=<?= urlencode($cssVersion !== '' ? $cssVersion : (string)time()) ?>">
 </head>
-<body>
-  <main>
-    <div class="card">
-      <h1>Analyzing your requirements and generating your website…</h1>
-      <div class="loader" role="status" aria-live="polite" aria-label="Applying initial changes">
-        <span class="sr-only">Loading…</span>
+<body class="tetris-body">
+  <noscript>
+    <div class="alert alert-danger rounded-0 mb-0 text-center">JavaScript is required to play this Tetris app.</div>
+  </noscript>
+
+  <div class="page-shell">
+    <header class="app-header border-bottom border-secondary-subtle">
+      <div class="container-xxl d-flex flex-wrap align-items-center justify-content-between gap-3 py-3">
+        <div>
+          <p class="eyebrow mb-1">Arcade game web app</p>
+          <h1 class="app-title mb-0">Classic Tetris</h1>
+        </div>
+        <div class="d-flex flex-wrap align-items-center gap-2">
+          <span id="game-state-badge" class="badge status-badge state-ready">Ready</span>
+          <button id="pause-button" class="btn btn-outline-light btn-sm control-btn" type="button">Pause</button>
+          <button id="restart-button" class="btn btn-light btn-sm control-btn" type="button">Restart</button>
+        </div>
       </div>
-      <p class="hint"><?= ($_SERVER['HTTP_HOST'] ?? '') === 'appwizzy.com' ? 'AppWizzy' : 'Flatlogic' ?> AI is collecting your requirements and applying the first changes.</p>
-      <p class="hint">This page will update automatically as the plan is implemented.</p>
-      <p>Runtime: PHP <code><?= htmlspecialchars($phpVersion) ?></code> — UTC <code><?= htmlspecialchars($now) ?></code></p>
+    </header>
+
+    <main class="container-xxl py-3 py-lg-4">
+      <div class="row g-3 g-xl-4 align-items-start">
+        <div class="col-xl-8">
+          <section class="panel game-panel h-100" aria-labelledby="playfield-title">
+            <div class="panel-header d-flex flex-wrap align-items-center justify-content-between gap-3">
+              <div>
+                <p class="panel-label mb-1">Playfield</p>
+                <h2 id="playfield-title" class="panel-title mb-0">Pure gameplay, zero filler</h2>
+              </div>
+              <div class="panel-inline-stats d-flex flex-wrap gap-2">
+                <span class="inline-chip">Best <strong id="best-score-inline">0</strong></span>
+                <span class="inline-chip">Time <strong id="elapsed-time-inline">00:00</strong></span>
+              </div>
+            </div>
+
+            <div class="board-layout">
+              <div class="board-frame">
+                <canvas id="tetris-board" width="300" height="600" aria-label="Tetris playfield" role="img"></canvas>
+                <div class="board-overlay" id="board-overlay">
+                  <div>
+                    <p class="overlay-label mb-2">Press Enter to start</p>
+                    <h3 class="overlay-title mb-3">Stack clean. Clear fast.</h3>
+                    <p class="overlay-copy mb-0">Controls: move with arrow keys, rotate with ↑ or X, hard drop with Space.</p>
+                  </div>
+                </div>
+              </div>
+
+              <div class="stats-grid" aria-label="Game statistics">
+                <article class="stat-card">
+                  <span class="stat-label">Score</span>
+                  <strong id="score-value" class="stat-value">0</strong>
+                </article>
+                <article class="stat-card">
+                  <span class="stat-label">Lines</span>
+                  <strong id="lines-value" class="stat-value">0</strong>
+                </article>
+                <article class="stat-card">
+                  <span class="stat-label">Level</span>
+                  <strong id="level-value" class="stat-value">1</strong>
+                </article>
+                <article class="stat-card">
+                  <span class="stat-label">Drop speed</span>
+                  <strong id="speed-value" class="stat-value">0.90s</strong>
+                </article>
+              </div>
+            </div>
+          </section>
+        </div>
+
+        <div class="col-xl-4">
+          <div class="sidebar-stack d-grid gap-3 gap-xl-4">
+            <section class="panel compact-panel" aria-labelledby="next-piece-title">
+              <div class="panel-header">
+                <p class="panel-label mb-1">Preview</p>
+                <h2 id="next-piece-title" class="panel-title mb-0">Next piece</h2>
+              </div>
+              <div class="preview-wrap">
+                <canvas id="next-piece" width="144" height="144" aria-label="Next tetromino preview" role="img"></canvas>
+              </div>
+            </section>
+
+            <section class="panel compact-panel" aria-labelledby="multiplayer-title">
+              <div class="panel-header">
+                <p class="panel-label mb-1">Multiplayer</p>
+                <h2 id="multiplayer-title" class="panel-title mb-0">Play with a friend</h2>
+              </div>
+              <div class="multiplayer-block">
+                <div class="form-floating mb-1">
+                  <input id="player-name" class="form-control form-control-sm bg-dark text-light border-secondary-subtle" placeholder="Your name">
+                  <label for="player-name">Your name</label>
+                </div>
+                <div class="field-help mb-2">Used for room play and the database scoreboard.</div>
+                <div class="d-flex gap-2 mb-2">
+                  <button id="create-room-btn" class="btn btn-light btn-sm flex-grow-1" type="button">Create room</button>
+                  <button id="leave-room-btn" class="btn btn-outline-light btn-sm flex-grow-1 d-none" type="button">Leave</button>
+                </div>
+                <div id="room-code-card" class="room-code-card mb-2 d-none">
+                  <div>
+                    <span class="room-code-label">Room code</span>
+                    <div class="room-code-value" id="room-code-value">—</div>
+                  </div>
+                  <button id="copy-room-btn" class="btn btn-outline-light btn-sm" type="button">Copy</button>
+                </div>
+                <div class="join-row d-flex gap-2">
+                  <input id="room-code-input" class="form-control form-control-sm bg-dark text-light border-secondary-subtle" placeholder="Enter code">
+                  <button id="join-room-btn" class="btn btn-outline-light btn-sm" type="button">Join</button>
+                </div>
+                <div class="room-status mt-2 d-flex align-items-center gap-2">
+                  <span id="room-status-badge" class="badge status-badge state-ready">Offline</span>
+                  <span id="room-status-text" class="small text-secondary">Create a room to start.</span>
+                </div>
+              </div>
+            </section>
+
+            <section class="panel compact-panel" aria-labelledby="opponent-title">
+              <div class="panel-header">
+                <p class="panel-label mb-1">Opponent</p>
+                <h2 id="opponent-title" class="panel-title mb-0">Live board</h2>
+              </div>
+              <div class="opponent-wrap">
+                <canvas id="opponent-board" width="200" height="400" aria-label="Opponent playfield" role="img"></canvas>
+                <div class="opponent-meta">
+                  <div id="opponent-name" class="opponent-name">Waiting for opponent…</div>
+                  <div id="opponent-stats" class="opponent-stats small text-secondary">Score — · Level — · Lines —</div>
+                  <div id="opponent-status" class="opponent-status small text-secondary">Room idle</div>
+                </div>
+              </div>
+            </section>
+
+            <section class="panel compact-panel" aria-labelledby="session-title">
+              <div class="panel-header">
+                <p class="panel-label mb-1">Current run</p>
+                <h2 id="session-title" class="panel-title mb-0">Session detail</h2>
+              </div>
+              <dl class="detail-grid mb-0">
+                <div>
+                  <dt>Status</dt>
+                  <dd id="detail-status">Ready to start</dd>
+                </div>
+                <div>
+                  <dt>Pieces placed</dt>
+                  <dd id="detail-pieces">0</dd>
+                </div>
+                <div>
+                  <dt>Lines cleared</dt>
+                  <dd id="detail-lines">0</dd>
+                </div>
+                <div>
+                  <dt>Duration</dt>
+                  <dd id="detail-duration">00:00</dd>
+                </div>
+              </dl>
+            </section>
+
+            <section class="panel compact-panel" aria-labelledby="controls-title">
+              <div class="panel-header">
+                <p class="panel-label mb-1">Keyboard</p>
+                <h2 id="controls-title" class="panel-title mb-0">Controls</h2>
+              </div>
+              <ul class="controls-list list-unstyled mb-0">
+                <li><span>Move</span><kbd>←</kbd><kbd>→</kbd></li>
+                <li><span>Soft drop</span><kbd>↓</kbd></li>
+                <li><span>Rotate</span><kbd>↑</kbd><kbd>X</kbd><kbd>Z</kbd></li>
+                <li><span>Hard drop</span><kbd>Space</kbd></li>
+                <li><span>Pause</span><kbd>P</kbd></li>
+                <li><span>Restart</span><kbd>R</kbd></li>
+              </ul>
+            </section>
+
+            <section class="panel compact-panel" aria-labelledby="scoreboard-title">
+              <div class="panel-header d-flex justify-content-between align-items-end gap-2">
+                <div>
+                  <p class="panel-label mb-1">Database records</p>
+                  <h2 id="scoreboard-title" class="panel-title mb-0">Scoreboard</h2>
+                </div>
+                <span id="scoreboard-status" class="small text-secondary">Loading…</span>
+              </div>
+              <div id="scoreboard-empty" class="empty-state">No database scores yet. Finish a game to post the first result.</div>
+              <div id="scoreboard-list" class="scoreboard-list" aria-live="polite"></div>
+            </section>
+
+            <section class="panel compact-panel" aria-labelledby="history-title">
+              <div class="panel-header d-flex justify-content-between align-items-end gap-2">
+                <div>
+                  <p class="panel-label mb-1">Local records</p>
+                  <h2 id="history-title" class="panel-title mb-0">Recent runs</h2>
+                </div>
+                <span class="small text-secondary">Saved in this browser</span>
+              </div>
+              <div id="history-empty" class="empty-state">No completed runs yet. Finish a game and your latest result will appear here.</div>
+              <div id="history-list" class="history-list"></div>
+              <div id="history-detail" class="history-detail d-none">
+                <div class="history-detail-header">Selected run</div>
+                <dl class="detail-grid compact mb-0">
+                  <div><dt>Score</dt><dd id="selected-score">0</dd></div>
+                  <div><dt>Level</dt><dd id="selected-level">1</dd></div>
+                  <div><dt>Lines</dt><dd id="selected-lines">0</dd></div>
+                  <div><dt>Duration</dt><dd id="selected-duration">00:00</dd></div>
+                  <div class="full"><dt>Finished</dt><dd id="selected-finished">—</dd></div>
+                </dl>
+              </div>
+            </section>
+          </div>
+        </div>
+      </div>
+    </main>
+  </div>
+
+  <div class="toast-container position-fixed top-0 end-0 p-3">
+    <div id="game-toast" class="toast text-bg-dark border border-secondary-subtle" role="status" aria-live="polite" aria-atomic="true">
+      <div class="toast-header bg-dark text-light border-bottom border-secondary-subtle">
+        <strong class="me-auto">Tetris</strong>
+        <small id="toast-timestamp">now</small>
+        <button type="button" class="btn-close btn-close-white ms-2 mb-1" data-bs-dismiss="toast" aria-label="Close"></button>
+      </div>
+      <div class="toast-body" id="toast-body">Ready.</div>
     </div>
-  </main>
-  <footer>
-    Page updated: <?= htmlspecialchars($now) ?> (UTC)
-  </footer>
+  </div>
+
+  <div class="modal fade" id="gameOverModal" tabindex="-1" aria-labelledby="gameOverTitle" aria-hidden="true">
+    <div class="modal-dialog modal-dialog-centered">
+      <div class="modal-content bg-dark text-light border border-secondary-subtle">
+        <div class="modal-header border-secondary-subtle">
+          <div>
+            <p class="panel-label mb-1">Run complete</p>
+            <h2 class="modal-title fs-5" id="gameOverTitle">Game over</h2>
+          </div>
+          <button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal" aria-label="Close"></button>
+        </div>
+        <div class="modal-body">
+          <div class="summary-grid">
+            <div>
+              <span class="summary-label">Score</span>
+              <strong id="final-score">0</strong>
+            </div>
+            <div>
+              <span class="summary-label">Lines</span>
+              <strong id="final-lines">0</strong>
+            </div>
+            <div>
+              <span class="summary-label">Level</span>
+              <strong id="final-level">1</strong>
+            </div>
+            <div>
+              <span class="summary-label">Duration</span>
+              <strong id="final-duration">00:00</strong>
+            </div>
+          </div>
+          <p class="modal-copy mb-0">Press restart or hit Enter to jump straight into a new run.</p>
+        </div>
+        <div class="modal-footer border-secondary-subtle">
+          <button type="button" class="btn btn-outline-light btn-sm" data-bs-dismiss="modal">Review board</button>
+          <button type="button" class="btn btn-light btn-sm" id="modal-restart-button">Play again</button>
+        </div>
+      </div>
+    </div>
+  </div>
+
+  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-YvpcrYf0tY3lHB60NNkmXc5s9fDVZLESaAA55NDzOxhy9GkcIdslK1eN7N6jIeHz" crossorigin="anonymous"></script>
+  <script src="assets/js/main.js?v=<?= urlencode($jsVersion !== '' ? $jsVersion : (string)time()) ?>" defer></script>
 </body>
 </html>