This was the first Sonic game ever. It also is to this day still good. The plot is basic. Evil genius,known as Dr. Robotnik,is creating robots out of helpless animals. But there is one animal he can't catch. He is Sonic the Hedgehog. Out of all the Sonic games,this is the one with the best zones. My favorite is the Starlight Zone. This was revolutionary at the time,because there was much faster frame changing. The music(like in all Sonic games)is awesome,especially the Green Hill zone. This is a masterpiece that has survived the tests(and changes)of time. If you own a Genesis buy this game. You WILL love it.