Enter the following codes at the title screen. A sound confirms each cheat.

Extra Lives:
L2, R2, L1, R1, Down, Up, Up, Down

Stage Select:
L2, R1, L1, R2, Left, Right, Circle, Square, R2, L2

Unlimited Continues:
L2, R2, L1, R1, Left, Right, Down, Up

Gyruss game:
L2, L1, Left, Right, R1, R2

Pac-Tank game:
R2, R1, Right, Left, L1, L2

Weapon Select:
L2, R2, L1, R1, Up, Down, Down, Up. When the game starts, press and hold Square and press Triangle.

Sound Test:
R2, R1, L1, L2, Up, Right, Down, Left.

Movie Test:
L2, L1, R1, R2, Up, Left, Down, Right