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Sonic the Hedgehog (lost Winter Consumer Electronics Show 1991 demo build of Sega Genesis/Mega Drive platformer; 1991) - The Lost Media Wiki
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Sonic the Hedgehog (1991 video game) - Wikipedia
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File:Sonic the Hedgehog (SMS).jpg - Dolphin Emulator Wiki
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File:Sonic the Hedgehog 1991 logo.webp - Wikimedia Commons
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