The problem is, Valve originally used the Linux 'Tux' icon to show Linux compatibility:
They then replaced that with the SteamOS logo, which is basically the Steam logo in a coloured circle.
Steam Play is not Linux
If it doesn't have that little SteamOS icon at the end, it usually means it does not support Linux/SteamOS.
You see this all the time, but Steam Play does not mean it supports Linux & SteamOS. Steam Play means you buy it once, and it will only work on the platforms that the game supports directly. If a game is not Steam Play, you would need to re-buy it on each platform.
Here's one that only supports Windows & Mac for example:
Thoughts on it
I do think Valve need to do something to address this, I'm sure they know it's a little confusing, but it's possible they haven't even looked into it yet. It could also be possible that they simply don't care, but I would certainly hope they do.
Even moving the 'STEAMPLAY' text to the start instead of at the end would help somewhat, as it would clearly show the SteamOS icon by itself then.
It frustrates me to see the confusion from users across the internet on what game supports Linux, as it shouldn't be this difficult, but Valve have made it difficult for people by not fully thinking this through.
One thing to remember: Not everyone has been around Linux as long as we have to understand the distinction between the icons. Remember the confusion isn't the fault of the user, this is a poor design choice from Valve. We have to remember this when seeing confused users. Help them, don't put them down.
It certainly doesn't help that Valve removed the SteamOS icon for a number of games as they work on Linux, but not SteamOS directly. Games like Starbound work fine on Ubuntu, but it has no SteamOS icon. There are further issues like Dying Light not having a SteamOS icon, due to some packaging issues, but it works 'fine' (In quotes, as that's debatable) on Linux & SteamOS.
What do you think Valve could do to help the situation for people?
Also, an honourable mention to the SteamDB Linux list. Human-confirmed Steam games that work on Linux, and games that have hints about coming to Linux on the other tab.Article taken from GamingOnLinux.com.
Do Some Games Work On Mac Free
One of our great features will be of particular interest for gamers who play on both PC and Mac machines: dual-platform play. For select EA games (that are available on both PC and Mac), you can buy a title once on Origin, and when you log into Origin on either Mac or PC, that same game will appear in your newly unified (Mac/PC) My Games library. Mar 04, 2016 Some of my games and apps that previously had sound and now do not, some of them I haven't tried since updating to windows 10 so I thought that could have been the problem and I tried changing the compatability mode on those apps and they still don't work, I also tried redownloading one of them and it still doesn't work. Why do some games work that are 32 bit apps and most don’t on MacOS Catalina? I’m not using any mods or anything that even remotely resembles a hack or exploit to get this working but for some reason games like Cities Skylines and War Thunder still work, even though they both have a message warning me that 32 bit apps don’t work.