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Sonic the Hedgehog (Sega Genesis) - Sales, Wiki, Cheats, Walkthrough, Release Date, Gameplay, ROM on VGChartz
http://www.vgchartz.com/game/6427/sonic-the-hedgehog/Japan/

Japan Weekly Video Game Chart, Week Ending 29th Sep 1991 - VGChartz
http://www.vgchartz.com/weekly/33510/Japan/

日本の週間のチャートだとTotal 112,509本でメディクリの数字とほぼいっしょだが