Sonic Riders is now available for Nintendo GameCube for $39.99. The title is published by Sega. The game currently has a 56 percent average review ranking according to GameRankings.com (based on two reviews).The story is of a standard affair. The game sees Sonic the Hedgehog, Tails, Knuckles and others racing in Dr Robotnik Worldwide Grand Prix, to attain the grand prize -- a Chaos Emerald. Check out the game's official website for more info.