The game is comprised of six 'Zones' with three 'Acts' each. This was by far the best-selling game for the Genesis/Mega Drive with over 15 million units sold worldwide. Sonic the Hedgehog put the Genesis on the map and was a catalyst for the console dethroning The Big N with a 65% market share over the Super NES during the 16-bit Console Wars. In addition to the touted high-speed gameplay, gamers of the time were astonished by the impressive graphics, as well as the catchy soundtrack by Masato Nakamura of the Japanese pop group, Dreams Come True. It practically re-defined the platforming genre by adding branching paths and physics-based obstacles such as loops and slopes. Not only is Sonic far too fast to be caught, but thanks to his sense of justice, he's made it his mission to free his friends and take the fight to the doctor's doorstep. The island happens to also be the home of Sonic: an unusual blue hedgehog who possesses razor sharp quills, the power to run at supersonic speeds, and an attitude. Unfortunately for Robotnik, there's one problem.

Eggman is gathering up the intelligent animals that live there and systematically transforming them all into ' Badniks' an army of Robot Soldiers that he intends to use to conquer the planet. The story begins on the fictional South Island, located on Planet Mobius, note 'The new Mobius worlds are brighter, crisper, and much more detailed.' Yuji Naka (The planet was named for Naoto Oshima's favorite artist, Jean 'Mobius' Giraud ) where the insane scientist Dr. Both it and an 8-bit Master System / Game Gear counterpart were released in 1991.

Released in 1991 for the Sega Genesis, it marked the beginning of Sega's beloved Sonic the Hedgehog franchise and is one of the most iconic games of the 16-bit era. If you're looking for the 2006 game of the same name, go here.

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