Unlockables:
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Pause the game, and go into the options menu. This is called the Fortress
of Solitude, enter these codes anywhere in the menu. Try to enter them at
a fairly quick pace.
Result Code
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All Unlockables – Left, Up, Right, Down, Circle, Square, Circle, Up,
Right, Square Unlock
Infinite Metro Health – Circle, Right, Circle, Right Up, Left, Right, Circle
Unlock All Power-ups – Left, Circle, Right, Square, Down, Circle, Up, Down,
Square, Circle, Square