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

Since Sega decided to delist all versions of Sonic 1, 2, CD, 3 and Sonic & Knuckles from every digital store because of the upcoming release of Sonic

Classic Sonic Hack 'Sonic Megamix' Is Being Remade In Sonic Mania's Engine

Sonic CD (2012) - PCGamingWiki PCGW - bugs, fixes, crashes, mods, guides and improvements for every PC game

Sonic Adventure DX on Steam

Game Corner [Sonic CDay]: Sonic the Hedgehog CD (Xbox One) – Dr. K's Waiting Room

What's your favorite versions of Sonic 1, 2, 3, K, and CD? And yes, ROM hacks can count as your favorite versions. - Games - Sonic Stadium

Sega está retirando jogos clássicos de Sonic das lojas em todas as plataformas

Sonic Mania - The Cutting Room Floor

Sonic 1 Steam ROM + Sonic 2 Steam ROM + Sonic CD 2011 + Sonic 3 & Knuckles Steam ROM : SEGA : Free Download, Borrow, and Streaming : Internet Archive

Sonic CD Restored - 30th Anniversary Edition [Sonic CD (2011)] [Mods]