Bought this for my kids, on sale at BB 39.99 for Wii this week. They had the 360 and Wii versions side by side, things you may want to know :
-Xb version is 100x better looking, we all know that I am sure. But I mean it looks awesome, like straight from the movie.
-Wii version though is best for the kids. Mainly because it uses the Wheel like Mario Kart. Back of the Cars 2 box doesn't list the wheel, but you can use it. Much easier to control but the graphics are blah. Up to 4 players on Wii.