Bunch of bangers on this list already, but the one that sends shivers up my spine to this day is Crusader Kings 2.

The fungal infection of AI in everything in Windows 11 finally tipped me back fully into Proton-land, and I run Garuda and couldn’t be happier. All my games run, sometimes more smoothly than they even did on Windows, and I am reunited with my love: gnome3. Thank you, Valve. Thank you Linus.