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All Weapons:
During gameplay press pause and enter the following:
Square Circle R1 L1 R1+R2 Invincibility:
During gameplay press pause and enter the following:
Square Circle L1 L1+L2
Thanks to meteery
Level Select: At the Main Menu enter: R1, L1, R1+L1 All Weapons
Start a new game, then pause and press Square, Circle, R1, L1, R1+R2. You must enter the code within two seconds. Campaign Select
At the main menu, press Square, Circle, R1, L1, L1+R1. You must do this within two seconds. Clear Mine Fields Quickly
When entering a mine field, select your minesweeper. Walk forward a few paces and then hold in the roll button and roll left/right to clear mines. This will save a considerable amount of time. Invincibility
Start a new game, then pause and press Square, Circle, L1, L1 + L2. More Damage in Multiplayer
When using the flamethrower in two player mode, tap the X button instead of holding it. The flamethrower will then do more damage. Open All War Zones
Go in Options, Difficulty, and hold TRIANGLE, SQUARE, CIRCLE, and press L1+L2. Run Faster in Multi-Player Mode
Hold Square + Triangle to chase your opponent quicker. Secret Artifact
In level two, kill the Blue Spy and pick up the information he leaves behind. When you're ordered to evacuate the area, now ignore your orders and go to the Tan Post. Kill the guys their and cycle through your wepons until you see the info as your weapon. Press SELECT and read it. Happy hunting! Secret Key
If you enter the two player level "Clean Up This Mess!," and go into the closet (located in the North East direction, you will find a key located between the books. Once you have the key, look at your radar. You will see 2 doors, 1 is the closet, the other is where you use the key. Take the key there. When you are close enough, you will automatically use it.