In Sonic Riders, Sonic and his friends are on a mission to foil the evil Dr. Eggman and his new henchmen, the Babylon Rogues. Dr.Eggman has created the Ex World Grand Prix; a no-holds barred racing series where the fastest "riders" in the world participate in this tournament. Never one to turn down a challenge to prove his speed, Sonic and his friends join the tournament and uncover Dr. Eggman's true intentions. In Sonic Riders, players race on air boards through 13 amazingly detailed and challenging courses in either single player or 2 player multi-player mode. The innovatively designed tracks are filled with collectables, jump ramps for high flying acrobatic tricks, and long rails for grinding action. Riders will also ride "Turbulence" – waves generated from other riders – to boost their own speed. "Turbulence" can also be used as a moving half-pipe so riders can perform aerial tricks while racing past fellow competitors.