 In Sonic Riders, Dr. Eggman challenges Sonic and his friends to a Worldwide Grand Prix, and the prize for coming out on top is an ultra-rare Chaos Emerald! Gliding on air boards - which are performance-oriented for each playable character - gamers will experience a heightened sense of sports-style racing tension as Sonic and his pals perform tricks and stunts over treacherous wide-open terrain. Sonic and friends speed through tracks on air boards, using individual special moves to strike down opponents. Air is a big element of Sonic Riders. Your board s "fuel" source is air. You can fill up your air at various points on the course, but to race well you ll have to use another means of replenishment: performing tricks with your board. You ll also want to make use of turbulence from racers who are in front of you.