This should be in sonic unleashed.
Mario is not a playable character although you can play as him only as a custom character using game maker 8.
My personal favorite sonic game is sonic advance 2, but there is a new game coming out called "Sonic Generations" were you can play 2D or 3D sonic game and play as modern sonic or classic sonic, if you want more info look on youtube ;)
you can only play him at the end of the game.
Sonic Rivals. hope this helps
a game maker and to play them
Sorry kid... you cant play as Shadow or Metal Sonic. there not programed into the game.
Super Sonic is not playable in this game.
Sonic, Tails, Knuckles, Cream. And you can play as Amy, if you cleared the game in 100%
not yet but you can battle mecha sonic in sonic rpg episode 6
The maker is not doing hes best. He must work harder so we can play final fantasy sonic x7
Click the green arrow on the toolbar
Save it as a .exe file. (To do that go to the file menu and click save as executable)