1. Poy Poy
I bought a Multitap and 2 more controllers just for this game. It's definitely dated by todays standards, but man did we used to have fun playing this.
2. Boom Blox
Not quite an oldie (yet), but still damn fun. One of the few video games I can get my boyfriend to play!
3. Devil Dice
Another favorite puzzle game with a crazy multiplayer mode.
4. Taiko Drum Master
I still kick myself for not buying a second drum when they were dropping in price.
5. Buzz!: The Mega Quiz
Got it for Christmas when it came out but have only played it a handful of times. One day I'd love to get 2 sets of controllers and have 8 player mayhem!
6. EyeToy: Play
Sure the camera wasn't the best, but it was hella fun watching everyone play.
7. ChuChu Rocket!
It's ChuChu Rocket. What's not to love?
8. WarioWare: Smooth Moves
Unfortunately my copy is still in the hands of my niece. She loves it so damn much and doesn't want to give it up!