Sonic 1 (2013) - Green Hill Zone - News - Gallery - Sonic SCANF

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

The SEGA Five: Revisiting Green Hill Act 1 » SEGAbits - #1 Source for SEGA News

Sonic title cards - Plutiedev

Green Hill Zone by Corral-Summer on DeviantArt

Open Assets] - Green Hill Zone 2D - Level Remake

Sam Ryall Animation: Green Hill Zone. Act 1

Pixilart - Green hill zone act 1 by Gamer2312

Amiga / Amiga CD32 - Sonic The Hedgehog (Demo) - Green Hill Zone - The Spriters Resource

LEGO Ideas Sonic the Hedgehog Green Hill Zone (21331) Officially Announced - The Brick Fan

Sonic's Green Hill Zone Loop Challenge 76994, LEGO® Sonic the Hedgehog™