Secrets of Sonic the Hedgehog

Sonic Mania/Unused Graphics - The Cutting Room Floor

Sonic the Hedgehog Sprite Sheet - Evil Sonics Sonic Hacks

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

Sonic in Green Hill Zone [Sprite Animation/2K Special]

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

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

Pack de tiles da Green Hill Zone! :D

Sonic Mania Armless Sonic + More Green Hill

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

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