Obscure

Laser-sight pistol:
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:
Complete the game to unlock a making of, behind the scenes, and two music videos.

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

Special mode:
Complete the game.

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

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.