public static function create() {
        do {

            $code = Game::randStr();

            $query = 'INSERT IGNORE INTO games (code, player_count, valid_from, valid_to) VALUES (?, 2, DATE_ADD(CURDATE(), INTERVAL 8 HOUR), DATE_ADD(CURDATE(), INTERVAL 20 HOUR));';

            $pstmt = self::$db->query($query, array($code));

        } while ($pstmt->rowCount() == 0);

        return $pstmt->lastInsertId();
    }