Only play with SCR-GP once time im granprix mode to unlock it. but it's not confirmed yet By Phill07 "Aurora's Gueto"
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You beat heroes mode on story
yes you can unlock Cosmo in sonic riders zero gravity you cant get cosmo in sonic zero gravity riders for Nintendo wii. the characters you can get are sonic, tails, knuckles, jet, wave, storm, silver, blaze, knights, shadow, Amy, eggman, rouge, cream, billy hatcher, amigo, SCR-GP, and SCR-HD.
Sonic riders zero gravity is good cause of the character selection was better and the graphics were awesome, but zero gravity kinda sucks since you can't boost like the original sonic riders. I technically think that the story plot was the best in Sonic Riders; it's the game itself and it's plot.
Shadow is unlocked by completing the Hero Story;Silver, complete Babylon Story.
Really Easy, you unlock SCR-HD in free race after you have beaten the Babylon storyYou unlock SCR-GP by beating the Babylon Story