TAR-21 assault rifle:
To unlock the TAR-21 assault rifle, go to the “Press Start” screen. While holding R1, press down(2x), up(2x), square, circle,
square, circle, triangle, up(2x), triangle.
GI John Doe mode:
To activate GI John Doe mode, first pause
the game. Then, while holding R1, press L3, L3, X, R3, R3, circle, L3,
L3, square, R3, R3, triangle. If entered correctly, the message “GI
John Doe Mode” will appear. In this mode, guns fire blue and red lasers.
Third Person view:
To activate Third Person view, first pause the game. Then, while holding R1, press square, circle, square, circle, L3(2x), triangle, X, triangle, X, R3(2x).
Super Ragdoll mode:
To activate Super Ragdoll mode, first pause the game. Then while holding R1, press X(2x), O(2x), square(2x), triangle(2x), X, O, square, triangle.
M468 rifle:
To unlock the M468 rifle, go to the “Press Start” screen. While holding R1, press up, triangle, down, X, left, square, right, O, left(2x), right, square.
Big Head mode:
To activate Big Head mode, first pause the game. Then, while holding R1, press O, square, X, triangle, L3, triangle, X, square, O, R3.
Comcast Event multi-player map:
To unlock the Comcast Event multi-player map, go to “Extras”