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Sonic 1 IGTA Public Release 1 : Free Download, Borrow, and Streaming : Internet Archive

SEGA CLASSICS ARCADE COLLECTION 5 IN 1 SEGA CD GAME

VGJUNK: SONIC THE HEDGEHOG (MEGADRIVE / GENESIS)

I Don't Get Why Sega Wants To Brand Green Hill As The Main Location In The Series When Places Like Station Square And Central City Work Much Better : r/SonicTheHedgehog

Five Ways The Sega Genesis Changed The Video Game Industry

Retro Review - Sonic The Hedgehog

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

Earth, Sonic Wiki Zone

Sonic 1 Revisited - Green Hill Zone Act 1-3

SEGA cancels HYENAS and other unannounced titles by SEGA Europe [Update] - Gematsu

Sonic Mania – Sonic City Sonic the Hedgehog News, Media, & Community

Sonic the Hedgehog (lost Winter Consumer Electronics Show 1991 demo build of Sega Genesis/Mega Drive platformer; 1991) - The Lost Media Wiki