The Sonic 4 Saga continues as Sonic reunites with Tails for all new collaborative play!Following the events of Episode I, Metal Sonic has returned to form a formidable alliance with Dr. Eggman! To face this new threat, Sonic will have to call upon an old friend to help him save the day! Joined by Tails, utilise ingenious combination moves and race across four brand new Zones, in order to put an end to their evil plans!Play alone, or with a friend locally and online, in an evolution of Sonic 2's collaborative gameplay! Unleash Sonic and Tails’ devastating joint attacks and combination moves to fight the united force of Metal Sonic and Dr. Eggman.Episode II features an all new game engine, bringing you updated physics and an original graphical style as you race through four unique Zones and a new Special Stage.BONUS! Owners of both Episode I & Episode II will unlock Episode Metal! Play as Sonic’s greatest rival in this exclusive zone and experience the untold story behind Metal Sonic’s revival!