Secrets of Sonic the Hedgehog

Steam Workshop::Green Hill Zone - Sonic the Hedgehog

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

Green Hill Zone, Map of the Sonic the Hedgehog video game universe Wiki

ArtStation - Green Hill 3D Redesign

sonic sprite test 2 : r/SonicTheHedgehog

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

Chronicles' GHZ - Stage, Models, etc WIP thread, Page 3

green hill in simple sonic worlds by chucknick - Game Jolt

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

S2Beta:Prototype Zones/Emerald Hill - Sonic Retro