Cheat Mode
Pause the game, and go into the options menu. This is called the "Fortress of Solitude", enter the cheats anywhere in here:
[Left], [Y], [Right], [X], [Down], [Y], [Up], [Down], [X], [Y], [X] - All Powerups
[Left], [Up], [Right], [Down], [Y], [X], [Y], [Up], [Right], [X] - All Unlockables
[Up], [Up], [Down], [Down], [Left], [Right], [Left], [Right], [Y], [X] - God Mode
[Y], [Right], [Y], [Right], [Up], [Left], [Right], [Y] - Infinite City Health