2025.2.4 增加难度选择，新增3种困难异常

1.增加难度选择，点击开始游戏时，可选择简单或困难，两种难度
2.新增3种异常，所有难度都可以游玩所有异常
1. Add difficulty options. When you click to start the game, you can choose easy or hard
2. Added 3 new exceptions, all of which can be played on all difficulty levels