Special mode:
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Successfully complete the game.

Laser-sight pistol:
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Successfully complete the game under the normal or higher difficulty setting,
then start another game in special mode. The first available gun will now be a
pistol with a laser sight.

FMV sequences:
————–
Successfully complete the game to unlock a making of, behind the scenes, and two music videos.

Morgenstern bat:
—————-
Successfully complete the game, then start another game in special mode.

Alternate costumes:
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Successfully complete the game, then start another game in special mode.
Only characters that survived will have an alternate costume.