Zero- The Kamikaze Squirrel
Contributed by- Richard

Level select:
Pause the game and press R, Up, B, Y, A. 

Unlimited energy:
Pause the game and press B, Up, B(2), A. 

Unlimited lives:
Pause the game and press B, A, B(2), Y. 

Unlimited shurikens:
Pause the game and press Down. A, B. 

Enable all codes:
Pause  the game and press R, Up, B, A, Down, Up, B, Down, Up, B.