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Get onto the extras section of the main menu for codes of the following:
Circle, Left, Right, Circle, Square, L1.
Cheat: Infinite Power
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Insert the following code while browsing the main menu:
Square, Triangle, Square, Square, Square, L3 (click left analog
stick).
Cheat: Lisa Outfits & Trophies
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Get onto the game's main menu and insert the following:
Triangle, Square, Triangle, Triangle, Square, R3 (click right analog stick)
Marge's Outfits & Trophies
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