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Input these during the Credits Movie in the Main Menu section Invincible Mode: X + Z + R All Upgrades: X + Y + L Unlock All levels: X + Z + Y These cheats have been verified to only show up and not actually carry over into the actual gameplay session. The exceptions are Unlock Levels, which unlock all stages with a score of zero and Invincibility, which applies itself quite well to the Co-Op mode.  
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