Unlock All Extras:
Enter the following code at the Intro Screen to unlock all extras: UP(2), DOWN(2), LEFT, RIGHT, LEFT, RIGHT, CIRCLE, X.
Battling Seizure Robots - Playing from stage 1, defeat the battling robot.
Bongo's Angst - Playing from stage 1, get Bongo to appear in 4 different levels.
Dysfunctional Family - Play in a 4-player match with three other people.
Easier Than Arm Wrestling - Defeat the Wrestler without any player dying.
Falling For Smithers - Playing from stage 1, fall through the deck after Smithers.
Helper Monkey - While performing a Team Attack, damage 25 enemies.
It Tastes Like Burning - Hurt Smithers with one of his own bombs.
Best Score Ever - Earn 250 points (US) or 25,000 points (Japan) in a game.
Like Taking Candy From a Baby - Complete the game four times, once with each character.
Mr. Sparkle - From stage 1, make it to the stage 3 bosses in Survival Mode with the Japanese ROM.
Release The Hounds - Complete the game in 30 minutes or less.
"Excellent" - Complete the game on Expert difficulty in individual Quarters mode.