Stage Select:
Press at the title screen L1, R1, L1, R1, Left, Right, Circle, Square, R2, L2.

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

More Lives:
Press at the title screen L2, R2, L1, R1, Down, Up, Up, Down.

Unlimited Continues:
Press at the title screen L2, R2, L1, R1, Left, Right, Right, Left.

Movie Player:
Press at the title screen L2, L1, R1, R2, Up, Left, Down, Right.

Unlimited Lives
To enable this code, press L2, R2, L1, R1, Down, Up, Up, Down at the title screen. To use it, press Triangle + Circle while playing. When you run low on lives press Triangle + Circle and you will have 9 lives again.

Hidden Games:
To access the hidden games, enter one of the codes below at the main menu with the title in the background.

Hidden "Gyruss" Game -- Press L2, L1, Left, Right, R1, R2 Hidden "Pac-Tank" Game -- R2, R1, Right, left, L1, L2