Dr. Eggman is up to his dastardly tricks again! The demented genius has smashed the world into seven parts with Chaos Control, and plans to build an evil Eggman Empire amidst the confusion!

It's down to Sonic and Tails to return the world to its original state again. Separated from their friends, they have to team up and track down all seven Chaos Emeralds, and use the power of Chaos Control to undo Dr. Eggman's mischief. But Dr. Eggman won't be caught unprepared - he's used all his skill and cunning to create the ultimate fighting robot, designed to stop Sonic once and for all!

Features:

• Play as any one of five Sonic characters - Sonic, Tails, Knuckles, Cream or Amy - and choose a team mate to use special moves and reach secret areas. Twenty possible team combinations mean twenty unique routes through the game!
• Choose your own route to the finish. Select which Acts you want to play and what order you want to play them in. Use your team's unique abilities to reach hidden areas and unlock secrets. No two games will ever be the same
• Brand new multiplayer co-op mode - play through the whole game with a friend as part of an unstoppable team
• The fastest Sonic game yet - reach incredible speeds as you run, jump and grind through the game
• The sharpest, smoothest, graphics ever seen on Gameboy Advance
• Seven huge Zones to explore, each with multiple Acts and Boss stages
• Conquer the all-new mini games to reach special bonus stages
• Multiplayer battle mode - up to four players can race to the finish!