Secrets of Sonic the Hedgehog

Sonic Mania/Unused Graphics - The Cutting Room Floor

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

The Leaf Forest Zone - Sonic Advance backgrounds

Sonic the Hedgehog - Green Hill Zone by SonicDash57 on DeviantArt

Sega Genesis / 32X - Sonic the Hedgehog - Green Hill Zone Objects - The Spriters Resource

Game Boy Advance - Sonic Battle - Green Hill Zone - The Spriters Resource

The Textures Resource - Full Texture View - Sonic Adventure 2 - Green Hill Zone

Novos sprites (Green Hill) - Sonic Genesis

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

Green Hills Zone Sprites by Alex13Art on DeviantArt