How about Mario & Sonic Kart Transformed?

My source tells me Mario Kart U will have downloadable characters from popular EA games. And for a small fee you can purchase extra red shells.

Sumo Digital hinted at a Mario & sonic racing crossover in a tweet.

I wouldn't mind seeing Sonic or even a Sonic track in Mario Kart but I honestly don't think the two worlds would mesh that well for a whole game.

i can see sonic been in Mario kart, but Nintendo wouldn't risk ruining one of there biggest franchises making a cross over with all stars racing transformed.

I wouldn't buy that game. The controls of Sonic and SEGA All-Stars Racing Transformed are so god damn wonky, it destroyed any fun I might have had with the otherwise at least mediocre Mario Kart clone...

I see you prefer Mole kart over Sonic.

Hay, I prefer Mole Kart over Mario Kart (and honestly, what I've seen from Mole Kart still looks more fun than Sonic - at least they didn't make things worse in their ripoff)!

I hope not anyway... one is a good fun game, the other feel so heavy!

agreed :)