With Steam Deck coming to gamers everywhere later this year, Valve is putting a lot of effort on making their Proton compatibility tool for Steam Play support as many Windows games as possible. In fact, Valve said that they plan to make all Windows games in the Steam library compatible with Linux systems before the launch of the Steam Deck.
Proton 6.3-6 is here less than a month after Proton 6.3-5 to add support for more Windows games, including Blood of Steel, Guardians VR, 3D Aim Trainer, Rez Infinite, Sonic Adventure 2, Elite Dangerous, Homeworld Remastered Collection, Star Wars: Knights of the Old Republic, as well as Tokyo Xanadu eX+.