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iOS, Android Windows Phone Nintendo 3DS |genre = Platform |modes = Single player, multiplayer |platforms = Sega Genesis, Nintendo 3DS, iOS, Android, Windows Phone }} is a platform video game developed by Sonic Team, with assistance from Sega Technical Institute, and published by Sega for the Sega Genesis console. It was released worldwide in November 1992. The game is the second main entry in the ''Sonic the Hedgehog'' series, and the first to feature Miles "Tails" Prower, a flying two-tailed fox. He and protagonist Sonic the Hedgehog must stop the series antagonist Dr. Ivo Robotnik from stealing the Chaos Emeralds in order to power his space station, called the Death Egg. Development of the game began in November 1991, two months later than originally intended, because Sega of America felt that it was too soon for a sequel. Both American and Japanese Sonic Team staff contributed to development; art director Tim Skelly designed the appearance of the game's new 3D special stages, based on an earlier tech demo created by Yuji Naka. The staff increased the speed of ''Sonic the Hedgehog 2'' in comparison to its predecessor. As with the original game, the soundtrack was composed by Masato Nakamura. ''Sonic the Hedgehog 2'' was a critical and commercial success. It has sold over six million copies, making it the second-best-selling Genesis game behind the original ''Sonic the Hedgehog.'' It has since been released in several compilations and downloads for various platforms, which were also generally positively received. A remastered version was released on iOS and Android devices in December 2013, including new features such as Boss Rush and Time Attack modes, and the 'Hidden Palace Zone', which was scrapped from the original 1992 release. Two sequels, ''Sonic the Hedgehog 3'' and ''Sonic & Knuckles'', were released in 1994. ==Plot== The game's two protagonists are Sonic the Hedgehog and his sidekick, Miles "Tails" Prower; Tails is described as having idolized Sonic as a child and wanting to keep up with him.〔''Sonic the Hedgehog 2'' (Genesis) instruction manual, p. 3.〕 The game's premise is similar to that of the original ''Sonic the Hedgehog''. Sonic's nemesis, Dr. Ivo Robotnik, is planning world domination with his army of robots, which he has placed animals inside, and the power of the seven Chaos Emeralds. However, this time he is constructing an armored space station known as the Death Egg. The goal of the game is to defeat Robotnik, optionally saving as many animals as possible and collecting all seven Emeralds.〔''Sonic the Hedgehog 2'' (Genesis) instruction manual, p. 4.〕 By default, the game ends with Sonic riding on Tails' biplane, the Tornado. However, if the player has collected all of the Chaos Emeralds, Sonic, in his Super Sonic form, flies alongside it.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sonic the Hedgehog 2」の詳細全文を読む スポンサード リンク
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