During game play press 'Start' to pause the game and then hold L and R and input the following codes to unlock the corresponding effect. When you release L and R 'Code Enabled' will appear.

Unlock ALL Levels:
Y, X, Y, X, X, B

Unlock ALL Moves:
Y, X, Y, B, B, X

Extra Damage:
Y, X, Y, X, Y, B

Powered-Up Projectile Attacks:
Y, X, Y, X, B, X

Gain More Health from Power-Ups:
Y, X, Y, X, B, Y

Unlock Bonus Comic #1:
Y, X, B, B, X, Y

Unlock Bonus Comic #2:
Y, Y, B, X, B, X

Unlock ALL Mini-Games:
Y, X, Y, Y, Y, B

Unlock the following by completing the corresponding tasks.

Unlock Minigame - Range Driver 1:
Complete 10 Objectives

Unlock Minigame - Bumper Carts 1:
Complete 15 Objectives

Unlock Attack - Finishing Moves:
Complete 20 Objectives

Unlock Minigame - Race Track 1:
Complete 25 Objectives

Unlock Minigame - Bumper Carts 2:
Complete 45 Objectives

Unlock Minigame - Range Driver 2:
Complete 40 Objectives

Unlock Attack - Ground Pound:
Complete 50 Objectives

Unlock Minigame - Race Track 2:
Complete 60 Objectives