Alternate Costumes:
Successfully complete the game to unlock the Caped Crusader, Dark Knight, and World's Greatest Detective costumes.
Batmobile Missions:
Successfully complete the Batmobile level to unlock the time attack and extra missions under the bonus option.
Movies:
After completing certain levels, movies become unlocked. This includes movie footage and interviews.
Hint:
Roll into gas filled rooms so you wont lose lives.
(supplied by: kooldude)
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