All Weapons and Infinite Ammo:
Pause the game, highlight Weapons then press and hold Right + L2 + R2 + Circle + Square + X
Level Select:
Pause the game, highlight Select Mission then press and hold Left + L1 + R1 + Select + Square + X
Easier Enemies:
Pause the game, highlight MAP then press and hold Right + R1 + L2 + X.
Easier Enemies (PAL):
Pause the game, highlight MAP then press and hold Right + L1 + R1 + R2 + Circle + X.
Super Pistol:
Pause the game, highlight Weapons/9MM then press and hold Left + R2 + Select + L1 + Square + X.
Super Pistol (PAL):
Pause the game, highlight Objectives then press and hold Right + L1 + R1 + R2 + Circle + X.
View All Movies:
At the movie theater in the first level, pause the game, highlight MAPS then press and hold Right, L2, R1, and X.
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