Sonic's universe is thrown into chaos when a mysterious new power comes into force, creating 'time holes' which take Sonic and his friends back in time. While there, Sonic runs into some very familiar characters from his past including a younger, classic version of himself! Now they must defeat their enemies, save their friends, and find out who is behind this diabolical deed.

• New and exclusive environments for the Nintendo 3DS include an unlockable 'special stage'. Each environment features two tracks - one for Classic Sonic and one for Modern Sonic - designed to showcase the unique features of both Sonics.
• 2 Player Versus mode: Take on your friends and earn valuable status points.
• Street Pass: Collect new content and unlock bonus material, increasing variety, interaction and replayability.

Nintendo 3DS:ää varten on kehitetty uusia ja täysin omia kenttiä, mukaanlukien saavutuksilla avattava erikoistaso. Jokaisessa ympäristössä on kaksi rataa, toinen klassiselle ja toinen modernille Sonicille, joissa kumpikin pääsee panemaan parastaan.

• Kahden hengen vastakkainpeluumoodi
• Haasta ystäväsi ja ansaitse arvokkaita statuspisteitä.
• StreetPass
• Pelaamalla yli 100 kenttää läpi avaat pelin bonusmateriaalit, jolloin pelin monimuotoisuus, interaktiomahdollisuudet ja uudelleenläpipeluu monipuolistuvat.