Pause the game, hold L1 + R1 and press Circle, Circle, Left, Triangle, Circle, X. When you see "Enter Cheat" appear on screen, you're in:
| L2, R1, L2, L1, Triangle, Triangle | Turn Shellshock Off |
| Down, L2, L1, R1, Up, Square | Kill Nemesis |
| Circle, Down, Circle, Up, Triangle, Circle | Clear HUD |
| Up, X, R2, R1, Up, Square | Get OSS Document |
| X, Triangle, Circle, Right, Triangle, Circle | Suicide (Single Player) |