Prerelease:Sonic the Hedgehog (Genesis)/February 1990 - The

Sonic the Hedgehog by HaroonMaffeMaffeMaffe - Game Jolt

Custom / Edited - Sonic the Hedgehog Customs - Sonic (Sonic 1

Sonic 1, 2 & 3 Prototype Comparison (First Zone)

Sonic 1 Steam ROM + Sonic 2 Steam ROM + Sonic CD 2011 + Sonic 3

Release][N3DS] Sonic 1 & 2 (2013) Decompilation port

Sonic the Hedgehog (1991), Sonic Wiki Zone

Sonic 1 Prototype Title Screen DreamWorld Style by

Pixilart - A detailed Sonic 1 sprite by Diam0nddude

Sonic Hacking Contest :: The SHC2020 Contest :: Sonic 1 - Point & Click Edition :: By Nat The Porcupine

Sonic Superstars hands on: Sega's new Sonic game is a glossy spin