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In page Sonic the Hedgehog 2 (8-bit video game):

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The Game Gear version was included as an unlockable bonus in Sonic Adventure DX, released in 2003 for Nintendo GameCube and Windows, and as one of the games featured in the Sonic Gems Collection, released for GameCube and PlayStation 2 in 2005. The game was later re-released on Nintendo's Virtual Console service, with the Master System version released for the Wii Virtual Console in December 2008 and the Game Gear version released for the Nintendo 3DS eShop in June 2013.