- bug that caused ghost users to stay in rooms (only workaround for now)
 - bug that cause server to hang (but seems it's not fixed fully), server performance may also improve thanks to this fix
 - bug that allowed to access password protected room without password with quick play (reported by Caithness)
 - bug that allowed to level up in training by beating opponent below your current level (reported by Chinese Tetris Community)
 - bug that allowed to grind tp and exp by playing training after beating level 24
 - limit number of entries in single player rankings
 
