Dr. Eggman (a.k.a. Dr. Robotnik) has stolen the Red Chaos Emerald to create nuclear weapons. This has thrown the remaining Chaos Emeralds off balance, causing them to transport to a parallel universe. As a result, Sonic's home, South Island, is sinking into the ocean. Dr. Robotnik's stolen the red Chaos Emerald, and it's up to Sonic The Hedgehog to get it back! As Sonic or "Tails" the two-tailed fox, you'll zip through the Zones, using your quick moves and quicker thinking to collect rings and evade Robotnik's latest batch of badniks!