Pause the game, and go into the options menu. This is called the Fortress
of Solitude, enter the cheats anywhere in here.
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