Experience adventure on the mystical North Star Islands in this completely new version of the classic 2D Sonic high-speed action platformer. Play as Sonic, Tails, Knuckles, and Amy Rose, and utilize the brand-new Emerald powers to move and attack in dynamic new ways. Navigate alone or with up to three other players through beautiful, never-before-seen environments and stop Dr. Eggman, Fang, and a mysterious new foe from turning the island's giant creatures into Badniks before it's too late!

• A new take on a classic: The 2D Sonic high-speed side-scrolling action platformer you know and love, reimagined with full 3D graphics, new powers and abilities, an entirely new setting, and new gameplay possibilities! You've never played classic Sonic like this before!

• Play as your favorite characters: Choose from Sonic, Tails, Knuckles, and Amy Rose and use their unique abilities to carve your way through the North Star Islands as they battle to defeat Dr. Eggman, who has teamed up with an old nemesis, Fang.

• Harness the power of the Chaos Emeralds: Multiply yourself, swim up waterfalls, change your form, and more with the powers of the Chaos Emeralds.

• More friends, more fun: For the first time in a Sonic game, play the entire campaign with up to three other players in local 4-player co-op mode with drop-in and drop-out functionality.