Sonic 1 Next Level updated sprites by LeroyUrocyon on DeviantArt

NFG Games Presents - A Sonic the Hedgehog Sprite History

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

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

These edited Sonic 1 sprites are amazing!

Accurate Sonic 1/CD Sprites, Sonic 3 AIR Mods Wiki

NONBINARY MENACE — That one Sonic sprite found in old versions of

Mighty in Sonic 1 Rev 1.1 with Knuckles Chaotix sprites (S1 Hack

Sonic Sprites by SpongeDrew - Pixilart

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

Sonic 1 Delta - SSRG Demo release