All codes should be entered on the title screen :
Weapon select : L2, R2, L1, R1, Up, Down, Down, Up.
Bamboo Arcade : R2, R1, Right, Left, L1, L2.
Bamboo gyrus : L2, L1, Left, Right, R1, R2.
Unlimited continues : R2, R1, L1, L2, Up, Right, Down, Left.
Movie player : L2, L1, R1, R2, Up, Left, Down, Right.
These codes are to be done at the Title screen, and you should hear a noise if entered correctly.
For Extra Lives press : L2, R2, L1, R1, Down, Up, Up and Down. Now when you die in the game, you will have an extra chance to get a little further in your game.
For Stage Select press : L2, R1, L1, R2, Left, Right, Circle, Square,R2 and L2. If entered correctly, a Stage you wish to play in and begin.