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.
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.
you need to beat the game to unlock them
you play all misson thingyobobs
Get all gold medals on all missions By Hunter Ho
all the possible characters you can unlock are: Dr.Eggman, rouge, shadow, cream, knights, aiai, ulala, E-1000R, E-1000G. Im pretty sure that's all of them. the rest of the other characters are automatically unlocked.
by beating all the missions
you have to complete all Storm and Wave missions with any rank
You can't but if you get all extreme ranks on all missions then you can unlock him (it is only usable by sonic) By Hunter Ho
Impossible to obtain Super Sonic without getting Gold rank in all missions.
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.
Complete all missions to unlock Ulala, Aiai and Nights. For Sonic Riders: Zero Gravity, complete all missions to unlock Nights, Amigo and I think Billy Hatcher, I have them unlocked I just haven't played the game in ages.
Same with NiGHTS and Billy Hatcher. Complete all the missions
You have to defeat all story missions in team heros and team Babylon.