Sonic Riders teams up Sonic the Hedgehog, Tails, Knuckles and a group of new characters, in a wild new racing game. Dr. Robotnik has challenged racers from across the world to compete in his Worldwide Grand Prix, the prize being a Chaos Emerald. Sonic and his friends must compete get the Chaos Emerald before anyone else does. Multiple visually stunning locations from across the Sonic universe.