I dont have managed it to play call of duty under linux
But I have heard about that they want money in the future to play cod.
Neverwinter Nights - The best available RPG for Linux. but at the moment I play Spring/BA/CA the most. Awesome RTS, really one of the best out there.
Civilization III, IV, V, VI and Freeciv.
quick and simple - endless sky
long but simple - Civ V
long and I can't accomplish a single thing that I want- EU 4 myassignmenthelp
Personally, I now prefer to play apex legends over all other games and it's just addictive, because I've been playing almost daily for a whole year now. I was especially interested in playing after the help of the guys on this site https://z3ddota.com/games/apex-legends/rank-boost. They can really solve almost any problem of increasing the skills and rating of a hero, so if there are fans of this game among you, then I strongly recommend contacting them. It is not expensive at all, but very effective.