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

Sonic Origins Review – Half-Baked Hedgehog Rehash

Sonic Superstars game release date, news & gameplay

Sonic The Hedgehog 2 Classic - Apps on Google Play

Sonic's Ultimate Genesis Collection - Wikipedia

Sonic the Hedgehog 4: Episode Metal

Sonic the Hedgehog CD (2011)

Sonic Origins Review - Review - Nintendo World Report

Sonic CD 2011 3DS - GameBrew

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

Sonic 2 Community's Cut

Toei Sonic (S3) in Sonic CD [Sonic CD (2011)] [Works In Progress]

Sonic the Hedgehog 2 - Wikipedia

Sonic Origins cheat codes for level select, debug mode and Super Sonic