i know that some games arent compitable and been to the site that shows which game is and which is not, and i also know most mods dont work on linux version which is a boomer (skyrim and rimworld mostly)?
so for gamers, why did you change to linux being a mostly a gamer?
Tell your buddy you can play Helldivers with him!
Helldivers 1 and 2 are platinum and gold rated on ProtonDB with recent reports on both confirming they work well.
https://www.protondb.com/search?q=Helldivers