Join a thrilling high-speed battle to preserve a world ravaged by Dr. Eggman and a mysterious foe in the latest game from the creators of Sonic Colors and Sonic Generations. Experience exhilarating action with Modern Sonic, dash through challenging platforms with Classic Sonic, and wield innovative new gadgets as your Custom Hero Character.

In Eggman's most significant triumph yet, the wicked doctor has seized much of the world with an enigmatic new force. A resistance made up of Sonic's allies has come into being to combat this threat, and amidst the turmoil and wreckage, an unexpected hero will emerge to aid Modern and Classic Sonic in reclaiming the world. Despite their efforts, these three heroes might face an uphill battle, as Dr. Eggman has formed a new alliance of his own...