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How to beat last campaign level, try to get at least 1 weapon, run around
How to beat the last level
the stupid AI at "hard difficulty" will kill themselves the only one left should be the purple guy, be VERY careful try to kill him from close range by jump kicking him off or using shotgun.
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I finished the first four levels without using anything but the punch button. Sometimes the AI would just defeat themselves by jumping from too high, or jumping into a pit/acid.