The most fun game?

The Mario Kart game is awesome! My girls love Kirby's epic yarn, but it is mostly single player or 2 player.

i would say the Mario games

Well, there's always the New Super Mario Bros Wii game. If you've ever played the original Mario game for the Nintendo system then this one is a throwback. It uses the same formula for gameplay. The only difference is that you can play up to 4 players at a time so it's perfect as a family game. My six year old cousin has a fun time playing this game with us.

I suggest Rayman Raving Rabbids 2 game. (or other Rayman Raving Rabbids game but I recommend Rayman Raving Rabbids 2) My nephews and nieces all enjoyed this game so much especially playing it with 4 players! for me RRR2 has the most fun experience among the 3 RRR multiplayer mini games. Hope that helps!

World of Goo is a downloadable title. That game is simple to play and addicting. Also I believe it's only 10 bucks. Can't go wrong with that.