Dr. Eggman has used Chaos Control to break the world into 7 parts, and plans to rain confusion by turning each into a Dr. Eggman Empire. Sonic and Tails have to find all 7 Chaos Emeralds and use Chaos Control to return the world to its original state—before Dr. Eggman perfects his ultimate fighting robot! You'll pick 1 of 5 playable sonic characters, and a second as a partner to help in the quest to bring down the evil Eggman. Gain new abilities based on your partner, and master them all for a variety of exciting adventures. Or, link up Game Boy Advance systems for awesome 2 on 2 team battles.