You must complete everything and a get gold medal on everything.
You get emblems!
Break the records
nope lolz i wish
No you can't unlock Jet.
you don't unlock them they are playable when you first get the game
clear the adventure tours
In story mode(adventure tours) complete ten missions with one character then you will have that characters emblem
Winter Olympic Games was created in 1924.
The winter olympic games started Feb the 12
The Winter Olympic Games was held at Chamonix, France in 1924
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!
There are 25 if your asking but i can't name them all.