Cream, Rouge and Shadow: Complete Hero Story mode.
Dr.Eggman: Complete Babylon Story mode.
NiGHTS, AiAi and Ulala: Complete all missions in Mission mode.
E-10000G: Play 20 hours total in Sonic Riders.
E-10000R: Play 50 hours total in Sonic Riders.
Super Sonic: Achieve a GOLD Rank on all missions in Mission Mode.
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Get all gold medals on all missions By Hunter Ho
In Sonic Adventure 2 Battle(she is very hard 2 unlock get all rank A's with sonic!)Sonic Adventure DX,Sonic Advance 1 2 and 3(in 1 of them you have 2 unlock her).Sonic Riders.
Sorry, but there is no character as 'super sonic' in the game ultimate flash sonic, the only unlock-able characters are Amy Rose and Shadow The Hedgehog. For all the unlocked characters+all cheats+the full Juke box type in the password 595313131313131.
You have to get all the coins in each race/level, unlock all characters, then, you can use Super Sonic in Grand Prix. I beat the game.
All the characters in Sonic All Stars Transformed are unlocked by completing all levels of the game. Some characters require certain goals like race points but most of these are automatically achieved upon completing the game.