That’s the Sega Genesis/Mega Drive Classics collection. I have it myself (bought several years ago). It’s just an official emulator/GUI wrapper (styled like a bedroom with a CRT) that comes with the games. If you have the collection you can find all the ROMs in the collection’s folder and play them with whatever emulator you want. If Steam ever threatens to take them away I strongly recommend backing that folder up somewhere.
That’s the Sega Genesis/Mega Drive Classics collection. I have it myself (bought several years ago). It’s just an official emulator/GUI wrapper (styled like a bedroom with a CRT) that comes with the games. If you have the collection you can find all the ROMs in the collection’s folder and play them with whatever emulator you want. If Steam ever threatens to take them away I strongly recommend backing that folder up somewhere.