I forgot to report a bug that: when we used x2 or x3. Then switch to others, the game will not response (It is still running actually). For example, when i use x2, if i want to go faster in dungeon i switch to x3. Then i switch to x2 to do other contens, the game screen will be freezed although it is still running. If I switch back to x3, the game screen is loadable. If i want to play with x2 again, i have to restart the game.