Colors Live - HD Sonic 1 Sprite thingy by Animagination_Draws

Custom / Edited - Sonic the Hedgehog Customs - Super Sonic (Sonic 1/CD-Style) - The Spriters Resource

ArtStation - Sprite accurate Sonic The Hedgehog (16 bits).

Accurate Sonic 1/CD Sprites

The VG Resource - Doing Sonic 1-sized, Sonic 1-visual-styled

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

Sonic 1 Next Level updated sprites by LeroyUrocyon on DeviantArt

Sprites That Weren't In Sonic 1 Or CD - Comic Studio

Rip out some custom sprites for S1 Sonic - Comic Studio

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

Spelunky FYI: Modding > Spelunky 2 > Mod > Sonic the Hedgehog