Single Player, Xbox Live Multiplayer 1-2, Local Multiplayer 1-2, HD (High Definition). Dr.Eggman (AKA Dr.Robotnik) begins his zealous search for the Chaos Emeralds to fuel his new "Death Egg" contraption. One afternoon, he launches his full-scale attack on the island. Dr.Eggman imprisons all of the helpless animals of the island and turns them into mindless worker drones. Fortunately, Sonic will thwart the Doctor's plans at all costs. This time, he isn't alone, as Tails decides to aid him in the battle. Together they must locate the Chaos Emeralds before Dr.Eggman does, and put an end to this diabolical scheme.