Cheat mode
Win the New Challenger, Defender, and Champion circuits to unlock options that allows you to play as Itchy and Scratchy, Kodos and Kang, or Burns and Smithers, as well as an arena select.
Play as Bumblebee Man
When you play the game in the New Challenger Circuit, you will eventually fight Bumblebee Man. Defeat him and save the game to unlock him on the character selection screen.
Play as Moe
When you play the game in the New Challenger Circuit, you will eventually fight Moe. Defeat him and save the match to unlock him on the character selection screen.
Play as Professor Frink
When you play the game in the Defender Circuit, you will eventually fight Professor Frink. Defeat him and save the match to unlock him on the character selection screen.
Play as Ned Flanders
When you play the game in the Defender Circuit, you will eventually fight Ned Flanders. Defeat him and save the match to unlock him on the character selection screen.
Special Move
Be Willie And play challenge mode and while playing go towards the rope and press O.
'Bumblebee Man' Hint
On the New Challenger circuit you will finally come across 'Bumblebee Man' beat him and he will be come unlocked. After, quit the person you are using (e.g Willie) and start over with 'Bumblebee Man' as he is the best player to use to beat all the other characters including Ned Flanders.
Bonus Match Up
At the main screen when it says "press start" press circle, up, up, down, down, left, right, left, right. At the top it should say "bonus match up on." Then press start, at the bottom the screen there should be a new feature called "bonus match up."
Big Ape Mode
During game play press start then press circle, L1, circle, R1, circle, L2, circle, R2, you will hear a noise to confirm entry.
Big arm mode
At the "Press Start" screen or after pausing the game, press Circle, L1, Circle, R1, Circle, L2, Circle. If you entered the code correctly, you will hear a sound.
Display game completion date
At the "Press Start" screen or after pausing the game, press Square, Circle, L1, R1. If you entered the code correctly, you will hear a sound.