This is just talking about games approved through Valve’s verification process. There are a lot of games that work that are “unverified”, not to mention the entire history of gaming available through emulation.
cross-posted from: https://lemmy.ca/post/21835717
It plays way more than that, I play all sorts of “unsupported” games all the time - mostly they run fine or even great (never mind all the emulators lol)