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.
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Level select
Press Start to pause game play, then quickly press Square, Circle, R1, L1, then hold R1 and press R2. To unlock all war zones, hold Triangle + Square + Circle and press L1 + L2 at the difficulty option screen.
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Mysterious fourth key
In the two player lever "Clean Up This Mess," a fourth key can be found. In the level, search the walls for a large closet door and enter. In the closet are two boxes, a pair of sneakers, and a radiator-shaped object. In between the red radiator-shaped object is a light blue, almost green colored key. In the game, three keys are needed to open the portal in the last level. This fourth key has no apparent use.
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Run faster in multi-player mode
Hold Square + Triangle to chase your opponent quicker.
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All co-pilots unlocked
Enter Up, Down, Up, Down, Up, Down, Up, Down as a password.
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All helicopters in two player mode
Enter Down, Down, Down, Down, X, X, Circle, Circle as a password.
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Alternate ending sequence
Enter Square, Down, X, Down, Right, Right, Up, Up as a password, then play through the last mission.
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Multi-player passwords
| Password | Level |
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| Right, Up, Square, X, Up, Circle, Up, Right | 2 | | Left, Down, Left, Down, Up, Up, Up, Up | 3 | | Square, X, X, Square, Circle, Triangle, Triangle, Square | 4 | | Circle, Circle, Square, Down, Down, Square, X, X | 5 | | X, Up, Circle, Down, Triangle, Left, Square, Right | 6 | | Up, Down, Down, Down, Right, Left, Left, Left | 7 | | Left, Left, Triangle, Right, Right, Triangle, Up, Up | 8 | | Square, Square, Square, Circle, Down, Down, Down, Left | 9 | | Circle, Up, Left, Square, Up, Left, Down, Down | 10 | | Triangle, Circle, Triangle, Circle, Up, Up, Down, Down | 11 | | Up, Down, Left, Right, Circle, Circle, Up, Square | 12 | | X, Left, Left, Left, Square, Triangle, Circle, X | 13 | | Left, Down, Left, Down, Square, Circle, Square, Circle | 14 | | Down, Down, Down, Down, X, X, Circle, Circle | 15 | | Triangle, Down, Triangle, Down, Square, Up, Square, Up | 16 |
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Secret mission, bonus level
Enter Up, Down, Circle, Up, Down, Square, Triangle, Right as a password.
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Single player passwords
| Password | Level |
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| X, Down, Left, Left, Square, Circle, Circle, Right | 2 | | Triangle, Up, Left, Right, Down, Triangle, Circle, Up | 3 | | Down, Down, Square, Square, Left, Right, Circle, X | 4 | | Right, Right, X, Circle, Down, Up, Down, Up | 5 | | Square, Circle, X, Square, Triangle, Left, Up, Right | 6 | | Square, Circle, X, Square, Left, Up, Right | 7 | | Right, Down, Left, Up, Triangle, Down, Up, Down | 8 | | Circle, Circle, Right, Up, Right, Up, X, X | 9 | | X, Down, Down, Down, Down, X, Left, Right | 10 | | Triangle, Up, Circle, Down, Square, Left, X, Right | 11 | | Up, Up, Triangle, Triangle, Left, Left, Circle, Circle | 12 | | Left, Down, Left, Down, Square, Circle, Square, Circle | 13 | | Down, Down, Down, Down, X, X, Circle, Circle | 14 | | Square, Right, Left, Circle, Circle, Up, Down, Square | 15 | | Down, Up, Down, Up, Triangle, Circle, Triangle, Circle | 16 |
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All Weapons and Unlimited Ammo
Pause the game and quickly press Square, Circle, R1, L1, simultaneously press R1 and R2.
NOTE: If you entered the code correctly, "Power Up" will appear onscreen.
Unpause the game, and Sarge (your character) will have all weapons loaded with unlimited ammunition.
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Invincibility
Pause the game and quickly press Square, Circle, L1, simultaneously press L1 and L2.
NOTE: If you entered the code correctly, Sarge will be invincible during the current level.
Repeat the code each time you begin a new level.
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