View all the FMV Scenes
During the Intro Sequence, press C, X, B, Y, A, Z, Start.
On the Options Screen, highlight "Shurikens" and press and hold the Left and Right Shift buttons, and press C, A, and B.
Higlight Game Start and quickly press A, Z, B, Y, C, X and then Start. If you did it quick enough you will start with 99 lives.
During gameplay, pause the game and press A, B, A, B, C. Now use the D-Pad to pick your level.
Thanks to Revolution Reader Jason Beeman!