The VG Resource - Dolphman's sprite library of customs & edits

Steam Workshop::Green Hill Zone

Custom / Edited - Sonic the Hedgehog Customs - Green Hill Zone Background (Modern, Genesis-Style) - The Spriters Resource

Steam Workshop::Sonic 1 - Green Hill Zone

ArtStation - A Enhanced Version of Green Hill Zone

sonic sprite test 2 : r/SonicTheHedgehog

User blog:SalaComMander/SalaComMander's first sprite comic, Sonic Wiki Zone

Splash Hill Zone Video game sprites, Sonic, Cricut crafts

S1MD Green Hill Zone tilesets in S1MDMS style by HidroGeniuns on DeviantArt

Robot Game Design – Pixel art sprite art style mood boards – My work!

Secrets of Sonic the Hedgehog