Hold L and press Down, Up, Left(2), B, Right, Down, X at the main menu.
Unlimited health
Pause game play, then hold L and press Y, X, Y, X, Y, B, Y, B.
Unlimited rage
Pause game play, then hold L and press Left, Down, Left, Down, Right, Up, Right, Up.
Unlimited ammunition
Pause game play, then hold L and press Left, B, Right, X, Up, Y, Down, A.
Daywalker difficulty setting
Hold L and press Left, B, Up, Down, X, B, A at the main menu.
Escorted NPCs are invincible
Pause game play, then hold L and press X, B, Y, A, X, B, Y, A. This code can only be enabled in levels that you are escorting NPCs.
Unlock all weapons
Go to the Menu screen and hold L and press X, B, Down, Left, B, B, Y.
Defeating Midget Vampires
When you see midget vampires on any level, punch them with your fist and they will fly back. If you punch them in front of a wall, they will hit it, then hit the ground.