Making in an MMOG shouldnt be to hard. A buddy of mine did it with his game (which didnt last long), but now he serves a game called Ultima Online. Just host it with your PC, if you've got a good one with better than Dial Up.

Race-Battle, not to shabby, but everyone knows that Jazz would win. All that he'd have to do is shoot Sonic, and he'd be out. pfft, just stick to regular racing minigame, it would be much cooler.

But, mabey you could add Spaz & Tails in the mix too... mabey just on the side rooting their buddies on. But Hare is right, we should stop adding new ideas, so Im gonna stop.