All Extras...
	Cool Stuff...
	Japan ROM...
	Various Achievements...

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.

Beat the game with any character to unlock the following.

Unlockable	How to Unlock
Characters	Beat the game with Homer
Flashback	Beat the game with Bart
Music Test	Beat the game with Lisa
Sound Test	Beat the game with Marge

Beat the game with any character to unlock the Japanese ROM.

Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
"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.