All future weapons
At the code entry screen press X(3x's), Triangle, Circle(2x's), Square, X.

All past weapons
At the code entry screen press Circle(2x's), Triangle, Square, X, Triangle(2x's), Square.

Quadruple damage
At the code entry screen press Triangle(4x's), Square, X, Circle, Square.

Unlimited ammunition
At the code entry screen press X, Triangle(3x's), X, Circle, X, Square.

Invincibility
At the code entry screen press Square(2x's), X, Triangle, X, Circle, X, Circle.

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

Mission complete
At the code entry screen press Square(2x's), Triangle, Circle(2x's), X, Square, Triangle.

Level select
At the code entry screen press Square(3x's), Circle(3x's), Triangle(2x's). Note: Fore the PAL version of the game, press Circle(3x's), Square(3x's), Triangle(2x's) when your at the code entry screen.

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 just finish the game to access Centipede at the "Atari Games" menu. Note: If it is not available as soon as you finish the game, restart your PlayStation2, reload your game, and look at the "Atari Games" menu again.

Fight TX Endoskeleton in all battles
At the code entry screen press Triangle, Square, Triangle, X, Triangle(4x's).

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.

50% more health in combat with T800
At the code entry screen press Triangle(2x's), 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.

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 office on the far right side. Go near the computer and press X to play Missile Command. Then, finish the level to access the game at the "Atari Games" menu.

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

Hints & Tips

Beating the Infiltrator
This Boss battle is your mission in level 5. Now press the buttons as instructed by the bottom captions. Now do this at random so that the Infiltrator cannot predict your attack. When his health is lowered by 24, he will get a limp leg which will slow him down.