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Playstation - Shadow Gunner cheats

Invincible mode:
Hold Select and quickly push Triangle(3 times) at the main menu.
Then, push Triangle, O, O, Triangle, O, Square, X, X.

Overhead view:
Hold Select and quickly push Triangle(3 times) at the main menu.
Then, push Triangle, Triangle, X, X, Square, O, Square, X.

Invisibility:
Hold Select and quickly push Triangle(3 times) at the main menu.
Then, push Square, Triangle, X, Square, Triangle, O, X, Triangle.

Best gun:
Hold Select and quickly push Triangle(3 times) at the main menu.
Then, push X, O, Triangle, X, X, O, X, Square.

Stage select:
Hold Select and quickly push Triangle(3 times) at the main menu.
Then, press Square, X, Square, Triangle, X, Triangle, O, Square. 
Start a new game, then hold Select and push Left or Right at the 
mission introduction screen to select any stage.