Practice mode:
Hold A + B + C and press Start at the Sega logo. Hold A + B + C and press Start at the title screen. An option that allows practice on almost all levels with no Bosses will appear. Note: A Union Lizard coin (for 1 or 2 lives) will appear on almost every screen.

Extra life:
Do not hit any of the ninjas during the bonus round.

50,000 point bonus:
Use non-shuriken mode in the stage select.

Advance to level 3-2:
Allow the introduction sequence to continue until demo mode begins. Press Start to begin the game at level 3-2.

Hidden extra lives:

Level 2-2
Jump up and shoot an extra life where the fence starts for the second time.

Level 3-1
Walk to the far right on the third floor. Shoot the man standing on two boxes with a power shuriken. Enter the next level, then jump down to get two extra lives.