Farlight 84 has relaunched with a massive new upgrade that brings a first-person mode, but it's sadly now broken on Linux, SteamOS / Steam Deck.
It's not entirely clear if this is an anti-cheat issue, or if it's something that Valve now need to fix in the Proton compatibility layer for the fresh update. You can load into the menus just fine, but it will rapidly crash and quit to your Steam Library barely a few minutes into a match.
I'm hoping it's just another Hunt: Showdown 1896 situation, or the numerous times THE FINALS gets momentarily broken instead of being actively blocked like Apex Legends and many others. The bug has been logged on Valve's Proton GitHub page for it.
Currently, their Discord support team are simply telling people "the game does not support running under Linux" and just tell people to use Windows. I've sent off an email to their press team to see if we can get a clearer answer.
For now, our anti-cheat page is listing it as broken until we see what's going on. Be sure to keep an eye on that page for any changes to this and other games. Anti-cheat is proving to be a constant nuisance for gaming on Linux. One day I really hope Valve can solve this repeating issue.

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One day I really hope Valve can solve this repeating issue.The games are looking forensically for any behaviour that's not Windows; Wine is never going to be Windows. There's nothing Valve can do to change that; at best they can persuade developers not to automatically consider not-Windows as evidence of a cheating cheater by itself, and the weight of that persuasion is only going to come from market share.
the game does not support running under Linux
A most unhelpful response.