Input the classic Konami Code: Up, Up, Down, Down, Left, Right, Left, Right, B, A during the title screen to unlock all of the Cool Stuff without having to beat the game with everyone.
| Achievement | How to unlock
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| - Complete the game on Expert difficulty in individual Quarters mode.
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- Battling Seizure Robots (10)
| - Playing from stage 1, defeat the battling robot.
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| - Earn 250 points (US) or 25,000 points (Japan) in a game.
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| - Playing from stage 1, get Bongo to appear in 4 different levels.
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- Dysfunctional Family (10)
| - Play in a 4-player match with three other people.
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- Easier Than Arm Wrestling (10)
| - Defeat the Wrestler without any player dying.
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- Falling For Smithers (10)
| - Playing from stage 1, fall through the deck after Smithers.
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| - While performing a Team Attack, damage 25 enemies.
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- It Tastes Like Burning (10)
| - Hurt Smithers with one of his own bombs.
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- Like Taking Candy From a Baby (25)
| - Complete the game four times, once with each character.
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| - From stage 1, make it to the stage 3 bosses in Survival Mode with the Japanese ROM.
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| - Complete the game in 30 minutes or less.
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