GlouOSSteam & Proton
Steam runs natively on GlouOS, and Proton lets the vast majority of Windows-only games run without extra setup.
Installing Steam
Tick Steam in the installation wizard to have it ready on first boot, or add it later with Flatpak (see Installing apps). Sign in and your library is ready.
Enabling Proton
In Steam, go to Settings › Compatibility and enable Steam Play for all titles. Proton translates Windows games to run on Linux automatically.
Checking game compatibility
Most games work out of the box. For a specific title, community trackers such as ProtonDB report how well it runs and any tweaks needed.
Note
A few games with invasive anti-cheat do not run on Linux yet. This is up to each game's publisher.