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Square Enix invests in Linux distribution
(www.gamingonlinux.com)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
I'm not sure about the others, but I'm pretty sure Hitman isn't linux native.
As far as I can find on protondb, neither are Deus Ex or Tomb Raider.
I've never had any issues running those games through Proton though, so that's great.
https://www.protondb.com/app/203160
Square where early adopters of Linux back when Steam Machines V1 came out commissioning ports for a bunch of their Eidos (western) IPs. And then they stopped support for those ports when Proton came around
According to Wikipedia, Deus Ex MD, Hitman, Life is Strange 1&2, and the new Tomb Raider trilogy all have native Linux ports.
https://en.wikipedia.org/wiki/Feral_Interactive
That's because the IP rights for those games were sold.