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Sonic the Hedgehog is a platform game developed in Japan by Sega and published for the Sega Mega Drive/Genesis system. It is the inaugural game and 1st installment in Sega flagship Sonic the Hedgehog video game series, and was the first title developed by Sonic Team. The game was released in 1991 in North America, Europe, and Japan. It is sometimes retrospectively referred to as Sonic the Hedgehog 1 or Sonic 1 to differentiate it from both its main character and sequels in the same series. Sonic is a blue Hedgehog who lives on South Island with his animal friends. In this first chapter of an ongoing saga, Sonic encounters an evil scientist by the name of Dr. Robotnik(known as Eggman in the Japanese version of the Sonic the Hedgehog continuity) for the first time. Dr. Robotnik/Eggman seeks to obtain the powerful Chaos Emeralds for the purpose of creating Robotnik/Eggman Land, and sets about transforming animals into robots to serve his ends. Realizing Dr. Robotnik/Eggman evil ambitions, Sonic pursues him though several of the world Zones before eventually defeating him in Scrap Brain Zone. Following this victory, Sonic returns home to South Island to rejoin his friends and resume his normal life. If the player was able to collect all the Chaos Emeralds, their power produces new plantlife in the Green Hill Zone, which surprises Sonic.