TL;DR, Steam's Proton compatibility layer. 90% of steam games work out of the box on it, with the biggest exceptions that don't work being due to anti-cheats ex

TL;DR, Steam's Proton compatibility layer. 90% of steam games work out of the box on it, with the biggest exceptions that don't work being due to anti-cheats explicitly preventing the game from running in something like proton/wine. You can thank the steam deck for bringing this level of functionality, as it's basically a Linux box with -actually reasonable defaults-.