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There is none as Silver did not exist at the time of Ultimate Flash Sonic's creation.
Yes it does exist, it came out in 1992, its an old sonic game, its 2d. You can play as Sonic, and Tails following you around.
No Mobius does not exist and Sonic is from fantasy Earth in the main-canon of the games made by Sonic Team.
Sonic Heroes 2 does not exist.
Sonic battle online doesn't exist.
She doesn't exist until Sonic Advance 2.
Sonic riders, Sonic Riders: Zero Gravity and Sonic Free Riders already exist.
Shadow don't exist in sonic advance's series
No. It does`nt.
Sadly, yes. :(
Uh, no.
No!he is just a made up sonic fan charcter that tries to destroy sonic and shadow.