For the following codes, pause the game during gameplay, hold R1 and enter a code below...
3rd Person View:
Square, Circle, Square, Circle, L3, L3, Triangle, X, Triangle, X, R3, R3.
Big Head Mode:
O, Square, X, Triangle, L3, Triangle, X, Square, O, R3.
One Hit Kills Mode:
L3, R3, L3, R3, X, O, L3, R3, L3, R3 Square, Triangle.
GI John Doe Mode
L3, L3, X, R3, R3, O, L3, L3, Square, R3, R3, Triangle. This enables multiplayer tracers (red for red team and blue for Blue team). Works online, as well.
Different Ragdoll Physics
Pause game and enter: Hold L1, X, X, Circle, Circle, Square, Square, Triangle, Triangle, X, Circle, Square, Triangle.
TAR-21 Assault Rifle
When changing your character’s gear, hold R1 and enter: Down, Down, Up, Up, Square, Circle, Square, Circle, Triangle, Up, Up, Triangle. Check for the gun.
Go to Extras menu. You'll an option “Comcast Gift”. Enter it, and enter “Comcast Faster” as a code.