you need to beat the game to unlock them
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.
Silver is not in Sonic Riders. However, he is unlockable in Sonic Riders: Zero Gravity by completing the Babylon story.
you can not but you can unlock super sonic
Beat Babylon Story.
get extreme ranks on missions then you unlock the chaos emerald gear. use that and you'll turn into super sonic if you have rings. if you have 0 rings you'll have to run. (cant use on any characters but super sonic!
You beat heroes mode on story
Shadow - Beat Heroes story
No, but he is in Sonic Riders: Zero Gravity.
Sonic riders, Sonic Riders: Zero Gravity and Sonic Free Riders already exist.
Be in 1st place in ether Babylon Story or Sonic Story. I forgot which one it is.
Same with NiGHTS and Billy Hatcher. Complete all the missions
i believe it is sonic riders,this is because on sonic zero gravity,it goes slow,in the original,you go fast.so the original. :) by mobian angel