At the very end where you have to destroy the big robot, hit him with Terrence or Phillip dolls (be sure to get out of the way, type in BOBBYBIRD for all of the cheats plus invincibility)
When ever the robot goes to recharge, take out your pirahna throwing gun(sweet!) and keep shooting at the green button until he gets out of the recharger, continue to throw Terrence and Phillip dolls at him.
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