All weapons and infinite ammo
Press Start, highlight Weapons and press Right + L2 + R2 + Square + Circle + X.
Movie Theater Mode
After jumping out of the saloon window, there is an alley ahead and to the left. Go down it, and you'll be in a cul-de-sac blocked off by burning cars (on the far side of the cars, some terrorists are shooting it out with some CBDC agents on the roof). You will see a movie theater across the street from the alley. Go up to the door, pause the game, and go to the Map. Press L2 + R1 + X + RIGHT. Gabe will say, ''Got it!'' Exit the menu and resume the game, and you will find Gabe inside the theater. Go around past the concession stand and enter the red-curtained door to the auditorium. The FMV movies will begin to play in succession. Warning: Some of the movies include spoilers.
Stage Select
Press Start, choose Options, then highlight Select Mission and press Left + L1 + R1 + Select + Square + X.
Super ammunition
Start the game and hit pause. Then, highlight the map menu and press: right, R1, R2, X.
All weapons and infinite ammo...