Pause the game, and go into the options menu. This is called the Fortress of Solitude, enter the cheats anywhere in here.
Effect - Code
Infinite Metro Health - Y, Right, Y, Right, Up, Left, Right, Y
Unlock All Power-ups - Left, Y, Right, X, Down, Y, Up, Down, X, Y, X
Unlock All Unlockables - Left, Up, Right, Down, Y, X, Y, Up, Right, X
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