You don't.Sorry.
you cannot play as (metal sonic) on Mario and sonic at the OLYMPIC games,but a new game has came out in 2009 and its called,Mario and sonic at the winter olympic games and you can play as (metal sonic) on that game and heres the best part.you don't even have to unlock him because he is already there!
You can't play as Super Sonic.
No.Sorry.
There is sonic heros for sure and mario and sonic at the olympic games (2007 and 2012) and olympic winter games if you hack the game
he is a free character when you play it
=== === Whoever you play best as. == ==
Yes
Sonic no matter what you can play sonic and Mario at the olympic games and play the track game and lose to Mario of course but that's obviously not the point Nintendo purposely does that do the other characters have a chance.
u can already play as silver
If by good you mean worth playing for, then yes. In the Mario and Sonic London 2012 Olympic Games, Beijing Olympic Games, and Winter Olympics for Wii, there is a wide variety of characters from both Super Mario and Sonic the Hedgehog, good and bad guys. You can select one character to play with against other players in Olympic events. Its definitely an awesome game.
Purchasing Both Mario and sonic snowman sculpture's in shopping mode.And to get sonic and Mario's snow sculpture's u play with Mario and sonic in every Event's. That's how i did it.
You can be her in Mario Kart Wii You can also play her in Mario Kart DS. And In Mario and Sonic At The Olympic Games And Super Mario Strikers