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All power ups: pause the game then press: up, up, down, down, L1, R1,
L1, R1, X, O, you'll hear a tone indicating the trick worked.
Lose all power ups: pause the game then press: up, up, down, down, left,
right, left, right, X, O, (the old konami code) then unpause the game,
your character will be sorrounded by "Oh! My God" for brief momment
indicating the trick worked.
From Jesus Zhu