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Sonic the Hedgehog 2 (or simply Sonic 2) is a platform game developed by U.S. studio Sega Technical Institute in collaboration with Sonic Team, and published by Sega for the Mega Drive/Genesis. It was released in Japan on November 21, 1992 and in North America and Europe three days later on November 24, 1992 (Sega nicknamed the American and European release date, a Tuesday, "Sonic 2sday"). It is the sequel to Sonic the Hedgehog and was followed by Sonic the Hedgehog 3 in 1994. The game introduces Miles "Tails" Prower as a new playable character.
The story follows Sonic the Hedgehog and his new partner Tails on their mission to stop the evil Dr. Robotnik from stealing the Chaos Emeralds to power his Death Egg. Sonic and Tails must defeat Robotnik's army and free their friends.
As of June 2006, it has sold six million copies, making it the best-selling Sonic game of all time, and the best selling game on the Sega Genesis. The game was compatible with Sonic & Knuckles lock-on feature which allowed the player to play as Knuckles in Sonic 2. It has been included in a number of compilation packages on a range of platforms; on June 11, 2007, the game was made available on the Wii's Virtual Consol and released for Xbox Live Arcade on September 12, 2007. It has also been featured on Sonic Classic Collection for the Nintendo DS, and appeared as a release for the iPhone OS on April 20, 2010.