Having been broken apart by the evil Dr. Eggman, it's up to Sonic to put the pieces of the world back together again by retrieving the power of the chaos emeralds! In doing so, Sonic will find himself in a race against time and faced with an unusual situation that will challenge him in ways never before seen. Both day and night play different, yet important, roles in Sonic's newest quest... as the sun sets, a new adventure awakens.