Touch The Dead Codes -

Cheat mode:
Press , , , , at the main menu. The sound of a zombie will confirm correct code entry, and the logo will turn red. All missions, modes, and bonuses will be unlocked. During game play, you can now use and to cycle through the camera views.

Furious mode:
Successfully complete the game in Normal mode.

God mode:
Successfully complete the game in Furious mode.