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Genesis / 32X / SCD - Sonic the Hedgehog - Sonic the Hedgehog - The Spriters Resource

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Sonic 1 Pixel Perfect - Sonic Retro

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Sonic the Hedgehog (Mobile Decompilation) - PCGamingWiki PCGW - bugs, fixes, crashes, mods, guides and improvements for every PC game

New Sonic the Hedgehog (1991) prototype uncovered by preservation groups - Tails' Channel