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

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

Sonic Frontiers (Video Game) - TV Tropes

Sonic Superstars game release date, news & gameplay

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 2011 3DS - GameBrew

Sonic 1: Sonic 3 Edition :: Full Game Playthrough (1080p/60fps)

Sonic the Hedgehog (1991 video game) - Wikipedia

Steam Community :: Sonic CD

Review: Sonic Origins is a tragic example of good classics ruined by greed