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

Sonic Advance Sprite Sheets - Game Boy Advance - Sonic Galaxy.net

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

MC Sonic the Hedgehog (1.2) by Aureumber on DeviantArt

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

Custom / Edited - Sonic the Hedgehog Customs - Sage (Sonic 3-Style) - The Spriters Resource

Mobile - Super Runners Sonic Games (Bootleg) - Sonic the Hedgehog

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

Custom / Edited - Sonic the Hedgehog Customs - Sonic (Mania, Sonic 1-Style) - The Spriters Resource

sonic 3 prototype sprites extended by enzogames29 on DeviantArt

Sonic [SMBGT] by SmashyBros on DeviantArt