Really Easy, you unlock SCR-HD in free race after you have beaten the Babylon story
You unlock SCR-GP by beating the Babylon Story
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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.
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.
1 word. NO
You beat heroes mode on story
When you get the attack item box you can charge into the bumper to activate a shortcut.