When you have the guns, if you tap square rather than holding it down and move the left analog stick, you will walk and shoot at the same time.

Pause the game and enter the codes during gameplay. A voice byte will play if the code was accepted.

• Inf Health and Necroplasm: UP, DOWN, LEFT, RIGHT, RIGHT, LEFT, DOWN, UP
• All weapons: UP, DOWN, LEFT, RIGHT, LEFT, RIGHT, LEFT, LEFT
• Inf ammo: UP, DOWN, LEFT, RIGHT, UP, LEFT, DOWN, RIGHT
• Inf Necroplasm: UP, DOWN, LEFT, RIGHT, DOWN, LEFT, UP, RIGHT
• No blood: UP, DOWN, LEFT, RIGHT, UP, UP, UP, UP.
• Unlock all comics: UP, DOWN, LEFT, RIGHT, RIGHT, LEFT, LEFT, UP.
• All missions: UP, DOWN, LEFT, RIGHT, LEFT, LEFT, RIGHT, RIGHT.
• Encyclopedia: UP, DOWN, LEFT, RIGHT, LEFT,RIGHT, UP, DOWN.