Enter the following codes quickly at the `Press Start` screen:
Big head Player:
Press Square, Circle, Circle, Square, Up, Square, Circle, Circle, Square, Triangle.
Big head Aliens:
Press Square, Circle, Circle, Square, Up, Square, Circle, Circle, Square, X.
Grayscale graphics:
Press X(2), Triangle(2), Square(2), Circle(2), Up, Down
Goodies option:
Press Triangle, Square, Circle, Left, Square, Triangle, Square, Circle, Left, Square. Go to the `optioons` menu to find a new selection.
Nakomi mode:
Press Up, Up, Down, Down, Left, Right, Left, Right, X, Circle.
Speed run:
Press X, Square, Triangle, Circle, X, Square, Triangle, Circle, L2, R2.
Sepia Graphics:
Press Left 10 times.
GameShark Codes
Have All Weapons P1 300936810003
300936820003
300936830003
300936840003
Infinite Ammo P1 800936b60006
Infinite Lives P1 800936bc0005
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