Sonic the Hedgehog 2
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Sonic the Hedgehog 2, also called Sonic 2, is second video game in Sonic the Hedgehog series. It is sequel to Sonic the Hedgehog. It was made by Sonic Team and published by Sega for the Sega Mega Drive in 1992. Unlike the first game, it has a half-pipe special stage and has seven chaos emeralds (see "chaos emerald") instead of six. It also introduces Tails.