Game wouldn't start using native version, had to use proton, then I tried launching from the game directory from terminal and got an error similar to this: https://github.com/ValveSoftware/Source-1-Games/issues/6982 you need to install lib32-gpreftools AUR link (if you're on arch): https://aur.archlinux.org/packages/lib32-gperftools then add the following launch option if still not launching: GLIBC_TUNABLES=glibc.rtld.execstack=2 %command%

Works pretty fine