Experience an adventure through the mystical Northstar Islands in this brand-new version of the classic 2D Sonic high-speed action platformer. Play as Sonic, Tails, Knuckles, and Amy, and utilize the brand-new Emerald powers to move and attack dynamically. Navigate through breathtaking, never-before-seen environments alone or with up to three other players, and prevent Dr. Eggman, Fang, and a mysterious new foe from turning the islands' giant animals into Badniks before it's too late!

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

Play with your favorite characters: Choose from Sonic, Tails, Knuckles, and Amy, and use their unique abilities to carve a path across the Northstar Islands while trying to defeat Dr. Eggman, who has teamed up with an old nemesis, Fang, and a mysterious new armored opponent.

Harness the power of the Chaos Emeralds: Multiply, 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, you can play the entire campaign with up to three other players in local co-op mode with drop-in and drop-out functionality.

Challenge players from around the world: Compete locally or online with up to eight players in the brand-new Battle Mode!.