Well… This is… Different. Sega has announced a huge update to their classic MegaDrive titles on Steam, yes this includes the Sonic titles (eventually).
How it works, if you own any classic SEGA title on Steam, it will now appear in a virtual hub room, aside from a cool menu to select your titles from, there’s another huge added bonus. Every game in this collection will include Steam Workshop support! This means you’ll be able to download mods for various titles and play them via Steam.
The hub is released on April 28th, you just need to own one compatible game to access it. Sonic is not in the launch list, but is shown in the video as being an upcoming game which will be added.