Unlock Cheat Mode
During gameplay pause the game and hold L1 + R1 and press Circle(2), Left, Triangle, Circle, X. If the code has been entered correctly 'Enter Cheat' will appear on the screen. Release L1 + R1 and enter the following codes to activate the corresponding effects. Enter the code again to disable it's effect.
Unlock Infinite Ammunition:
Press L2, L1, Square, L2, L1, R1.
Unlock Full Adrenaline Meter:
Press L1, R2, R1, Up, Triangle, Circle.
Kill Mission Nemesis:
Press Down, L2, L1, R1, Up, Square.
Pickup OSS Document
Press Up, X, R2, R1, Up, Square.
Press L2, R1, L2, L1, Triangle(2).
Press Circle, Down, Circle, Up, Triangle, Circle.
Press X, Triangle, Circle, Right, Triangle, Circle (Single-Player mode only).
When you successfully complete a level you will get one Medkit each person in your squad that did not get killed.
When you successfully complete a mission with ALL objectives you will get one revive.
Added by: Sanzano Sep 27th 2007, ID#27820