The Simpsons Arcade Game Cheats

Unlock All Extras
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.

Achievements
Complete each achievement to get the allotted gamerscore.
"Excellent" (30): Complete the game on Expert difficulty in individual Quarters mode.
Battling Seizure Robots (10): Playing from stage 1, defeat the battling robot.
Best Score Ever (25): Earn 250 points (US) or 25,000 points (Japan) in a game.
Bongo's Angst (10): Playing from stage 1, get Bongo to appear in 4 different levels.
Dysfunctional Family (10): Play in a 4-player match with three other people.
Easier Than Arm Wrestling (10): Defeat the Wrestler without any player dying.
Falling For Smithers (10): Playing from stage 1, fall through the deck after Smithers.
Helper Monkey (10): While performing a Team Attack, damage 25 enemies.
It Tastes Like Burning (10): Hurt Smithers with one of his own bombs.
Like Taking Candy From a Baby (25): Complete the game four times, once with each character.
Mr. Sparkle (25): From stage 1, make it to the stage 3 bosses in Survival Mode with the Japanese ROM.
Release The Hounds (25): Complete the game in 30 minutes or less.