Steam on Linux
Steam Play Proton Project [github.com]

Some proton Games I've tested (on a 15W i5 7200u Dual Core + Intel HD 620 GPU):

Working perfectly:
Witcher 3
Elex
ES Oblivion
Skyrim + Skyrim SE
Fable TLC
Majesty Gold HD
Stronghold Crusader Extreme HD
GTA San Andreas
Not working:
(None so far)
Sorry, did I mention I use Arch? I use Arch just fyi. Am an Arch user.
I use Arch.