Yes, works perfectly on the Steam Deck, and it is arguably the best way to play it handheld. It can be installed via Emudeck or by running the Linux native version.
Purchase the Sonic 3 & Knuckles DLC for the SEGA Mega Drive & Genesis Classics hub on Steam. sonic 3 and knuckles steam rom download best free
Play Sonic 3 & Knuckles: Safe and Legal Ways to Enjoy the Classic Yes, works perfectly on the Steam Deck, and
Sonic 3 and Knuckles is an iconic platformer that combines the best of Sonic 3 with the challenging levels and gameplay of Knuckles the Echidna. With stunning graphics, addictive gameplay, and an unforgettable soundtrack, this game is a must-play for any Sonic fan. Play Sonic 3 & Knuckles: Safe and Legal
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(available on Steam, Epic, Consoles) This is the definitive official collection. It includes Sonic 3 & Knuckles as a single combined game with: