S2Beta:Prototype Zones/Neo Green Hill - Sonic Retro

Sonic Mania - The Cutting Room Floor

Genesis / 32X / SCD - Sonic the Hedgehog - Green Hill Zone Act 2 - The Spriters Resource

Custom / Edited - Sonic the Hedgehog Customs - Green Hill Zone - The Spriters Resource

Custom Green Hill Sprites [Outdated] by FuzzysArting on DeviantArt

Green Hill Re-Imagined Sprites by Exclipsy on DeviantArt

Pixel Joint Forum: Sonic 1 Title separate BG sprites?

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

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

MerrydriveMarcy on X: Replaced the background and frontground with Emerald Hill sprites! (Because the first week is against Sonic from Sonic 2) #Sonic #SonicTheHedgehog #SonicMania #Sonic1 #Sonic2 #SonicTheHedgehog2 #SonicTheHedgehog1 #FNF

Secrets of Sonic the Hedgehog