I would recomend that as well to everyone contemplating buying this game. I did a very idiotic thing. Literally no joke 5 seconds after seeing it on my email i connected to Orange World and downloaded it within a minute of seeing it. Its a piece of shit and ruins a jem so to speak.
However the graphics are quite nicely ported. No real changes from the Megadrive version although a lot of enemies seem to be removed from the game
Taking a further piss there are no Bonus Stages, you get 50 rings, jump into the hoop at the end and you get the chaos emerald.
I have been well and truely ripped off but there is no way to get a refund or anything like that. Oh well it would be something to play if i was ever bored and without my DS.