It is available by itself or as a bundle that includes both Sonic Rivals and Sonic Rivals 2.Playable charactersIn Sonic Rivals, you can choose from 5 different characters to play as.SonicKnucklesShadowSilverMetal SonicZonesSonic Rivals contains 6 zones.Each zone contains 2 acts and a boss act.The stage layouts are the same for each character. Furthermore, all characters go through the zones/acts in the same order.