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Playstation 2 - Masters of the Universe He-Man: Defender of Grayskull cheats

Go to the cheats section of the options menu and enter 
one of the following codes:

Code - Effect
X, Left, Up, Circle, Down - Unlock all stages
Circle, Right, X, Up, X - 2x Damage 
Right, Circle, Up, Left, X - God mode 
Down, Right, X, Circle, Down - Unlimited Grayskull power