Max Payne

Invincibility:
Pause the game and press L1(x2), L2(x2), R1(x2), R2(x2). Note: This code may need to be re-enabled after an auto-save.

Unlock Slow Motion Sounds:
Enter L1, L2, R1, R2, Triangle, Square, X, Circle, at the pause screen.

Get Eight Pain Killers:
Pause the game and enter: L1, L2, R1, R2, Triangle, Circle, X, and Circle or Square.

All Weapons and Full Ammunition:
Pause the game and press L1, L2, R1, R2, Triangle, Circle, X, Square.

Level Select:
Play through the game normally until completing Subway A1. Return to the main menu and press UP, DOWN, LEFT, RIGHT, UP, LEFT, DOWN, Circle.

 