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Sega Genesis / 32X - Sonic the Hedgehog (Prototype) - Green Hill Zone Act. 1 (Dark) - The Spriters Resource

Green Hill Zone (Sonic Mania) - Sonic Retro

Green Hill Zone (Sonic Mania), Sonic Wiki Zone

Green Hill Zone Act 1 by Unknow_rpg

Green Hill Zone by Corral-Summer on DeviantArt

Steam Workshop::Sonic 1 - Green Hill Zone

Green Hill Zone Act 1 - Sonic Mania - OST - (Extended)

Worms Map Database - Maps - Sonic Mania - Green Hill Zone - Act 1

Stream Sonic Mania - Green Hills Zone Act 1 by Sonic Hedgehog