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

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

Sonic CD 2011 3DS - GameBrew

Sonic Generations Collection on Steam

Sonic Origins Review – Half-Baked Hedgehog Rehash

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

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

Sonic Origins is a masterclass in messing up a classic

Sonic: do pior ao melhor segundo a crítica

I dunno if you guys noticed, but Sonic CD's depot was silently updated and now it shows Linux support : r/linux_gaming

Sonic the Hedgehog Franchise Sale on Steam - Sonic Colors Ultimate & more up to 75%

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

Why is nobody talking about Knuckles now (officially) being able to be played in Sonic CD? (Sonic Origins Plus) : r/SonicTheHedgehog

Ports of Sonic CD and Marathon 2 Make Their Way to iOS - MacRumors

Sonic 2 Community's Cut

Sonic the Hedgehog CD