Obviously highly anticipated second STH game that is revered as the best Sonic game ever but that's up for you to decide between all the others that follow. Introduces you to a seventh Chaos emerald along with the ability to become super Sonic and a new playable character, tails 'miles' prower (miles per hour hahaha). Robotnik's at it again and it's up to Sonic and his buddy Tails (or not depending if you play without tails or as him) have to stop him by collecting all the Chaos emeralds and stopping Robotnik from completing his ultimate weapon, the Death Egg. Travel through new stages and special stages in the second installment in the Sonic series which are sure to give you a run for your money. Again, to own a Genesis is to own all the Sonic games.