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Custom / Edited - Sonic the Hedgehog Customs - Sonic (Sonic 1

Modern Sonic Sprite Sheet by RedactedAccount on DeviantArt

PC / Computer - Sonic Screensaver - Sonic - The Spriters Resource

Genesis / 32X / SCD - Sonic the Hedgehog 2 (Prototypes) - Sonic the Hedgehog (Earliest Alphas) - The Spriters Resource

Archive] Sonic The Hedgehog - Sonic Nexus (2008) by AsuharaMoon on DeviantArt

Custom / Edited - Sonic the Hedgehog Media Customs - Sonic (SatAM) - The Spriters Resource

Sonic the hedgehog 2 remastered sprites by seb2006fnaf on DeviantArt

Genesis / 32X / SCD - Sonic the Hedgehog 3 - Continue Screen - The Spriters Resource

Sonic Blast Sprite Sheets - Sega Game Gear - Sonic Galaxy.net

Sega Genesis / 32X - Sonic 3 Complete (Hack) - Sonic (Sonic 1) - The Spriters Resource