The main monsters to look out for are the two chainsaw ladies on stage 1. Once you kill them, they keep coming back. On stage 2 and 3 be careful of the guys with the chain guns. On stage 4, there is a super chainsaw man. He is bigger than the normal one and has a twin bladed saw. He is almost impossible to stop. He does not climb ladders. He jumps to where he needs to be. He will run at you, swinging the saw. Do not run past him. Turn and jump down if you can, or climb something quickly. If you really want to get past him, try using Jack Krauser's transformation, and aim right at him. If you miss, you are dead. Additionally, Krauser's transformation will kill anyone in one hit as long as you are close enough. Also Flash Bang, Kick are very good for crowds with Krauser. These two things will make Krauser the easiest to get five stars with.