Unlimited health:
Pause game play, then quickly press Black, White, L, X, L, White. The sound of an explosion will confirm correct code entry.
Bonus costumes:
The following costumes will become unlocked at various points throughout the game, after a particular mission.
Original
Golden Age
Silver Age Superman Red
Silver Age Superman Blue
The Return of Superman Black
Superman of the 90s
Kryptonian
Post-Our Worlds at War Mourning
Kingdom Come
Free roam option:
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Successfully complete mission 4 to unlock the free roam option. This allows you to replay any mission that has been completed in single mission mode.
