Unlimited ammunition:
At the code entry screen press X, Triangle, Triangle, Triangle, X, Circle, X, Square.

Invincibility:
At the code entry screen press Square, Square, X, Triangle, X, Circle, X, Circle.

All future weapons:
At the code entry screen press X, X, X, Triangle, Circle, Circle, Square, X.

All past weapons:
At the code entry screen press Circle, Circle, Triangle, Square, X, Triangle, Triangle, Square.

Quadruple damage:
At the code entry screen press Triangle, Triangle, Triangle, Triangle, Square, X, Circle, Square.

Mission complete:
At the code entry screen press Square, Square, Triangle, Circle, Circle, X, Square, Triangle.

Level select:
At the code entry screen press Square, Square, Square, Circle, Circle, Circle, Triangle, Triangle.

Fight TX Endoskeleton in all battles:
At the code entry screen press Triangle, Square, Triangle, X, Triangle, Triangle, Triangle, Triangle.

50% more health in combat with T800:
At the code entry screen press Triangle, Triangle, Square, X, Circle, Triangle, Square, Circle.

50% more health in combat with TX:
At the code entry screen press Square, Triangle, Square, Triangle, Circle, X, Circle, X.

50% less health in combat with TX:
At the code entry screen press X, Triangle, Square, Circle, Triangle, X, Square, Triangle.

Centipede mini-game:
At the code entry screen press Circle, Circle, Circle, Square, Square, Square, Triangle, Square. Or complete the game to unlock Centipede at the "Atari Games" menu. If it is not unlocked as soon as you complete the game, restart your PlayStation2, reload your game, and recheck the "Atari Games" menu.

Missile Command mini-game:
At the code entry screen press Circle, Circle, Circle, Square, Square, Square, X, X. Or, in the vet's office on level 13, walk into the small office on the far right side. Approach the computer and press X to play Missile Command. Then, Complete the level to unlock the game at the "Atari Games" menu.

All FMV sequences:
At the code entry screen press Triangle, Circle, Square, X, X, X, Triangle, Circle.

All still pictures:
At the code entry screen press X, Square, X, Square, Circle, Triangle, Circle, Triangle.

View development team:
At the code entry screen press Circle, Circle, Circle, Square, Square, Square, Triangle, X.