Sonic the Hedgehog 2

The gameplay of Sonic the Hedgehog 2 builds upon the basic set-up of the original Sonic the Hedgehog game. The player finishes each level, generally moving from left to right, within a time limit of 10 minutes. Along the way, rings are collected and Badniks are defeated. Star posts serve as checkpoints, where if the player was to lose a life then he or she would return to one. When the player has collected at least 50 rings, star posts can be run past for an optional Special Stage. At the end of the last act of each zone (with the exception of Sky Chase Zone which does not have a boss), Sonic confronts Dr. Robotnik.