Sonic the Hedgehog © 1991 Sega of America, Incorporated.
US release. For more information on the game itself, please see the Japanese version's entry; Sonic the Hedgehog [Model G-4049].
GAME ID: 1009
CART ID: 670-1469
COVER ID: 670-1470
Sonic the Hedgehog for Genesis was released on June 23, 1991 (Sunday) in North America. A reprint exactly 2 days later was labeled as "Not For Sale". The game was also re-released in 1995 as a 'Sega Classics' edition [Model 1009].
Sega Genesis (1995) 6-Pak [Model 1717] Sega Genesis (1997) Sonic Classics Sega Saturn (jul.31, 1997) Sonic Jam [Model 81079] Sega Dreamcast (jan.31, 2001) Sega Smash Pack Vol. 1 [Model 51146] (nov.10, 2002) Sonic Mega Collection [Model DOL-GSOE-USA] Microsoft XBOX (nov.2, 2004) Sonic Mega Collection Plus [Model 64057] Sony PS2 (nov.2, 2004) Sonic Mega Collection Plus [Model SLUS-20917] Sony PS2 (nov.7, 2006) Sega Genesis Collection [Model SLUS-21542] (nov.19, 2006) [Model MAHE] (feb.10, 2009) Sonic's Ultimate Genesis Collection [Model 68034] (feb.10, 2009) Sonic's Ultimate Genesis Collection [Model BLUS-30259] Sony PSP (nov.16, 2006) Sega Genesis Collection [Model ULUS-10192] Nintendo DS (mar.2, 2010) Sonic Classic Collection [Model TWL-VSOE-USA] (mar.9, 2007) Sonic Mega Collection Plus (oct.26, 2010) "Sonic the Hedgehog [Model 71113]" 
(oct.26, 2010) (mar.15, 2011) Sega Genesis Classic Collection - Gold Edition (jul.3, 2013) "Sonic Hits Collection"