Green Hills Zone Sprites by Alex13Art on DeviantArt

Sonic Mania - The Cutting Room Floor

Green Hill Zone – Duth Olec's Cuckoo Cosmos

Sprites and Hoaxes – Shauniversal Studios

Sonic 1 HD: Green Hill Zone by Hyperchaotix on DeviantArt

I made Green Hill Zone in note blocks for my friend's Minecraft recreation of Sonic The Hedgehog (1991) : r/SonicTheHedgehog

The Spriters Resource - Full Sheet View - Sonic the Hedgehog (Prototype) - Green Hill Zone Act. 1 (Normal)

Sonic The Hedgeblog — In early 'Sonic 1′ screenshots the Green Hill Zone

Sonic The Hedgeblog — Past Green Hill 'Tails & The Music Maker' SEGA

Sonic Mania Sprites Sonic Amino PT~BR© Amino

Sonic 1 Green Hill Canvas Wrap