Get All Chapters:
Go to the Press Start screen then to the New Game screen and hold L1 + L2 + R1 + R2 and press Down, Left, Down, Triangle, Down.

Unlimited Ammo:
Go to the Press Start screen then to the New Game screen and hold L1 + L2 + R1 + R2 and press Up, Left, Down, Right, Circle.

Unlimited Shotgun:
Go to the Press Start screen then to the New Game screen and hold L1 + L2 + R1 + R2 and press Right, Circle, Circle, Circle, Square.

Make Enemies Weaker:
Go to the Press Start screen then to the New Game screen and hold L1 + L2 + R1 + R2 and press Square, Left, Triangle, Up, Down.

Get All Disarms:
Go to the Press Start screen then to the New Game screen and hold L1 + L2 + R1 + R2 and press Square, Square, Circle, Circle, Right.

Get 2 Guns:
Go to the Press Start screen then to the New Game screen and hold L1 + L2 + R1 + R2 and press Triangle, Circle, Up, Up, Up.

Precursor mode:
Go to the Press Start screen then to the New Game screen and hold L1 + L2 + R1 + R2 and press Up, Up, Down, Down, Up. A message will confirm correct code entry. This will turn off cursors

Get hard Boiled Mode:
Go to the Press Start screen then to the New Game screen and hold L1 + L2 + R1 + R2 and press Triangle, Square, Left(2), Circle. A message will confirm a correct code entry. This mode increases challenge levels alot.

Disarm Hints:
Disable the Random disarms option. Every type of weapon has five disarms (Circle, Up + Circle, Left + Circle, Right + Circle, and Down + Circle). The shotgun's disarm is Circle & Up + Circle.

Unlock the Mini-games:
To unlock the mini-games, just beat the game on any dificult mode.