Explore the mysteries of the Northstar Islands in a brand-new version of the classic 2D Sonic action. Play as Sonic, Tails, Knuckles, and Amy Rose and use the new Emerald powers to move and attack in dynamic ways. Navigate stunning environments, either alone or with up to 3 other players, and stop Dr. Eggman, Fang, and a mysterious new rival from turning the islands' giant animals into Badniks before it's too late!