Obscure

Special mode:
Successfully complete the game.

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

Laser-sight pistol:
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.

Alternate costumes:
Successfully complete the game, then start another game in special mode. Note: Only characters that survived will have an alternate costume.
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FMV sequences:
Successfully complete the game to unlock a making of, behind the scenes, and two music videos.

Alternate menu background:
Successfully complete the game.

Gallery 1:
Successfully complete the game under the hard difficulty setting.

Gallery 2:
Successfully complete the game in special mode.