游戏难度将由玩家们的表现决定。举例来说，如果玩家能够在一个区域内毫发无伤地通过，那在下一个区域中子弹的数量就会相应减少。

The Difficult is directed by the player; for example, if a player goes through an area without taking damage, there'll be less bullets in the next area.