God mode:
     Pause the game and press Square, Circle, Left, Right, Circle, Square.

Max ammo:
     Pause  the  game  and  press Left, Right, Circle, Circle, Circle,
Right, Left.

All weapons:
     Pause the game and press Left, Circle, Right, Square, Right, Left.

Level skip:
     Pause the game and press Up, Down, Left, Right, Right, Left, Circle.

All characters:
     Pause  the game and then press Left, Left, Circle, Circle, Right,
Left, Circle.

Level Select:
     Save  your game and go back to the main menu. Once you are at the
resume  game  screen,  highlight  your  saved game and press Up, Down,
Down, Up, Left, Up, Right, Down.

Unlock Fatboy Mutator:
     Go  to  the  title  screen  and press Circle, Circle, Circle, Up,
Down, Down, Up, Circle, Circle, Circle.

Unlock Stealth Mutator:
     Go  to the title screen and press Square, Square, Circle, Circle,
Square, Square, Circle, Circle.

Unlock Big Head Mutator:
     Go  to the title screen and press Left, Right, Left, Right, Left,
Right, Circle, Circle, Circle.