Double Health
Enter this code during the introduction cinema:
UP, UP, LEFT, LEFT, RIGHT, RIGHT, CIRCLE, CIRCLE, DOWN
Infinite Ammo
Enter this code during the introduction cinema:
UP, DOWN, LEFT, RIGHT, TRIANGLE, UP, DOWN, LEFT, RIGHT, SQUARE
Regain Health:
Regain health by leaning against walls and waiting during game play, you will be limited doing this depending on how badly you are hurt.