Invincibility
Pause your game and quickly press Square, O, L1, L1 + L2. If you completed the code correctly Sarge will be invincible during the current level.

All Weapons
Pause your game and quickly press Square, O, R1, L1, R1 + R2. If you completed the code correctly Sarge will have access to all the weapons for the current level.

Level Select
From the Main Menu, quickly press Square, O, R1, L1, L1 + R1.

All War Zones
Select "Options", then enter the "Difficulty" selection screen. Then, hold Triangle + Square + O and press L1 + L2.

First person view:
Hold Start + Circle + Square during game play. The game will pause. press Start to resume the game in the first person view.

Run Faster in Multi-Player Mode:
Hold Square + Triangle to chase your opponent quicker.

More Damage in Multi-Player Mode
When using the flamethrower in two player mode, tap the X button instead of holding it. The flamethrower will then do more damage.

Cheats