Sonic Mania/Unused Graphics - The Cutting Room Floor

Enhanced Green Hill Zone [Sonic Mania] [Works In Progress]

Sonic the Hedgehog Sprite Sheet - Evil Sonics Sonic Hacks

Steam Workshop::Sonic 1 - Green Hill Zone

ArtStation - A Enhanced Version of Green Hill Zone

Custom / Edited - Sonic the Hedgehog Customs - Green Hill Zone Chunks (Prototypes, Sonic Mania-Style) - The Spriters Resource

Green Hill Zone Expanded by UltraEpicLeader100 on DeviantArt

Green Hill Re-Imagined Sprites by Exclipsy on DeviantArt

Splash Hill Zone Video game sprites, Sonic, Cricut crafts

Modding Sprites in Sonic Mania Problem

S2Beta:Prototype Zones/Emerald Hill - Sonic Retro