Sonic starts of with 200 rings, you must hit him seven times for him to lose them and begin phase 2, in phase 2 his attacks are completely random and exponentially more difficult, but all it takes is one hit to knock him out of hyper form, at wich point, you won
Visual detail: in phase 1 he glows. In phase 2 he flashes the entire rainbow(like sonic 3 A N D K N U C L E S)