You get a game over and go back to the story select screen and you restart the stage you were on with the default amount of lives. Which I think is 3 but I haven't gotten a Game Over for bout 3 years since, it hard to lose all 99 lives XD
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I just don't know I'm tryin to figure it out also.
Never lose a single match and beat Metal Sonic once and during the second round Sonic will go super.
well beat the game 20 times :[ with sonic then play as tails but lose everytime then play as sonic agin and baet meltle sonic 10 times then ther you go
Tails killed Sonic in self-defence because when Snively injected that formula into Sonic's arm, it turned Sonic evil. If Tails hadn't have stabbed Sonic, he would have been choked to death, so it was a lose-lose situation, anyway. And I'm sure that the last thing Tails wanted to do was kill his best friend. I'm pretty sure that Tails killed Sonic because he had to. Sonic is the fastest thing alive, he always wins, and he can become Super Sonic if he has the Chaos Emeralds. Tails had to kill Sonic because if Sonic is a bad guy then everyone may as well kill themselves. No, he didn't want to, but Tails can't technically be choked, as he has no neck.
you lose...