Obscure Cheats

Finish the game one time using anything EXCEPT
easy mode and start a new game in special mode.  Now the first gun
will be the laser pistol

Successfully complete the game to unlock a making of, behind the scenes, and two music videos.

Unlock Special mode:
To unlock Special mode successfully complete the game.
Unlock Morgenstern Bat:
The Morgenstern bat will become available when you successfully complete the game and start another game in Special mode.
Unlock Laser-sight Pistol:
The Laser-sight Pistol will become available when you have successfully completed the game on Normal or higher difficulty setting and then start another game in Special mode.
Unlock Alternate Costumes:
Complete the game successfully and then start another game in Special mode. Only the characters that survived the completed game will have an alternate costume.
Unlock FMV sequences:
Complete the game successfully to unlock behind the scenes, two music videos and making of FMV sequences.

For every character that survives to the end a new outfit will be unlocked for that character

Complete on each of the difficulty settings to unlock the music videos.