Pause the game. Now hold L1 and enter the following codes:

Level select:

Circle, X, Circle, Square, Square, Triangle, X, X. Note: This may also be done at the main menu.

Unlock all doors:

Triangle, Square, Square, Triangle, X, Circle, Square, Triangle

Full map:

X, Circle, Square, Triangle, Triangle, Square, Circle, X

See ending:

Square, Triangle, Square, Square, Circle, Circle, X, Triangle

Full health:

Triangle, Triangle, X, Circle, Circle, X, Square, Square

Restore Ammo:

Square, Square, Circle, Triangle, X, Triangle, X, Triangle.

Invincible hostages:

Circle, Circle, Square, Triangle, X, Triangle, X, Circle.

All Main Guns:

X, Circle, Circle, Triangle, Square, X, Square, Circle.

Supermen:

X, Square, Triangle, Triangle, Circle, Square, X, X.

Player Invincibility:

Square, X, Triangle, Triangle, X, Square, Circle, Circle.