
Does not work on desktop linux. Seems to work on Steam Deck according to github proton issue #7964
gamemoderun LD_PRELOAD="" STEAMDECK=1 %command% -dx11 -USEALLAVAILABLECORES
Tried multiple solutions, the launch options listed are all that I tried (including trying them all together). Also tried multiple proton versions, Experimental and GE-9-23 are able to log in (crash when starting game) but Proton 7.0-6 and GE-7-37 errors out and exits on login.

Launched and ran a game of attack and defend with no problem. Ran at close to 60 fps consistently
only launcher works

Nop, not working, at least on the desktop
On PikaOS , I couldn't get past the login screen. Some trolls claim this game runs on Linux, but that’s not true.

The launcher works but you cannot get in
-dx12 -USEALLAVAILABLECORES
network error

I installed the game from steam launcher works, I registered but the game silently quits when I click launch.
-dx12 -USEALLAVAILABLECORES
I tried adding "-dx12 -USEALLAVAILABLECORES" as some users suggested, both with and without and tried Proton Experimental as well as recommended all done by steam.

Doesn't launch
I can get into the launcher, have tried tons of different versions of Proton, both GE and non-GE, tons of different launch options. Nothing works. I get into the launcher but after I press Launch it either closes everything after 2-3 seconds or with Proton 7 it doesn't close but nothing opens either.
ITS FIXED! it runs great from 30-60fps on external monitor at 1920x1080 on high graphic setting.
-dx12 -USEALLAVAILABLECORES
Launcher opens. Game dies when clicking play. That's all.

-dx12 -USEALLAVAILABLECORES
Sometime during the end of March, the devs seemed to have updated the game to allow the Steam Deck to play the game again without being blocked by anti-cheat. Because of this, many version of proton work again.
I am using an LED Steam Deck. I got the best performance from GE-Proton9-27 but other version should work. Set resolution to 720, all settings on low, and FSR to performance. You should get 45-60 fps in Operations Mode. I also highly recommend installing Decky and then Fantastic. This will allow you to set a more aggressive fan curve to keep temps under 80C.
If you have issues logging in, do so in Desktop mode. If you get the retry option, click it 4-5 times. If you still can't get in, relaunch the game and try again. Game finally works again! Woohoo!

Launcher works - Logs you in and crashes
LD_PRELOAD= XMODIFIERS= WINEDLLOVERRIDES="winhttp.dll=n,b" MANGOHUD_CONFIG="fps_limit=240" DXVK_ASYNC=1 VK_LOADER_LAYERS_ENABLE=VK_LAYER_MANGOHUD_overlay_x86_64 PROTON_USE_WINED3D=1 %command%
Game uses Anti-Cheat Expert (ACE) which technically supports linux but publisher has not performed tasks to enable compatibility.

-dx11
Must use Desktop Mode for initial log-in. After that, you must click retry 4-6 times for the game to connect and allow you to launch.
Proton-7.3-GE-1 had the best performance before SteamOS 3.7 preview update. On 3.7, you must use -dx11 due to an error where the game does not think your hardware is dx12 compatible. dx11 works but there are frequent stutters while in game.
Must set all settings in game to low. Use AMD FSR set to performance. Recommend playing with mouse and keyboard.
Game is very capable of running at a smooth 40-60 FPS if devs allowed the latest Proton through anti-cheat.

No worky
gamemoderun LD_PRELOAD="" SteamDeck=1 %command%
As many others have reported, i tried some additional tinker steps with the launch options to see if it would launch, but it crashes as soon as you click on launch

The game starts initially and you get the option to log in, but after then pressing launch the game crashes.
Game is not currently playable on Linux
Broken not launching

Starts launcher, logs me in but crashes on game launch
I was able to get the launcher to log me in when started but all attempts at starting the actual game from the launcher failed. Tried various versions of Proton but none of them worked. Hopefully this gets resolved in the future.

Installed but wouldnt run
tried other proton versions and nothing would get it to launch.

Game will start stuttering after playing for a while. This seems to happen in all Unreal Engine 4 powered games. Can be fixed by restarting the game.
I am using an LED model. Unsure if this works on the OLED model. It's very playable if configured correctly. Must us Proton v7. Inital login must be done in Desktop mode. When launching the game, you will get a network error on the launcher, click retry 4-5 times and then it will give you a launch option. Set all graphic settings in game to low, set Streaming to High. FSR set to performance with base resolution set to 720p. Recommended to play with keyboard and mouse. Game will start to stutter after playing for a while. Restart the game to fix stuttering issues. I also recommend to install Decky and Fantastic pluging with a custom fan curve to help keep temps under 75 C.

I guess warning Linux users wasn't enough, so they outright broke the game at the opening company logos. 7.0.6 gave an error message on the client while default and experimental would load the game and crash at the previously mentioned spot.

Launcher starts, but that's about it
I am able to launch the game, but not sign in. I used Proton Experimental as well as Proton 9.0-4. Neither would let me launch the game, but I could get signed into the launcher client. It would crash when I press the "launch" button.

Borked
Tried all proton versions, won't work

Performance isnt really there for steam deck, dont know if it will work on other linux devices
Fps drops during gameplay. Fluctuates between 35-60 fps
Crashed while chaning controller layout, but didn't crash during the game. I only played 1 game.
Use proton 7.0-6

With any proton version, it always fails with the message "Network Error. Please check your network connection. ID: 4/77"
Unplayable atm. I guess it's the anticheat.
O jogo instala e chega a abrir uma tela de login, porém não é possível realizar o login, o login retorna um erro.
Game no worky :( "Assertion failed!" "Login failed, please try again. ID: 4/77"
Game not launch due to kernel level anticheat.
MANGOHUD=1 gamemoderun %command%

Delta Force launcher opens, but game does not open. Delta Force binding does not work either, meaning you can't login to account.
Game is currently unplayable. Developer (DF OPS | yyk) mentioned "Linux is currently not supported. And Steam Deck is also not supported at the moment, but we will start considering how to port it." ~ https://steamcommunity.com/app/2507950/discussions/0/4509877583653226327/

It opens the launcher but crashes when should start open the game. After this first try it started to getting a login or network error.
Not working
Game launches to Delta Force launcher, however seems to crash after clicking Launch
Proton Experimental

low fps

Unable to play
This has been said like a million times here, but the game is unplayable on Linux.
You can launch in to the "launch menu" just fine. But when you try to press the "launch" button, the game will never launch.

Won't start
It opens de launcher and makes you create an account but when you want to start the game it won't even run it.
Gets to launch screen then errors out with message stating it can't login and then shuts down

Aunque el launcher funciona, tiene fallos de conexión que se inventan los desarrolladores. Al iniciar la Steam Deck se calienta bastante, hasta el punto de apagarse por sobrecalentamiento con los gráficos en bajo y esto solo pasa en el menú, ya que nunca pude jugar al multijugador ni entrar en ningún modo de juego ya que o bien el juego se cerraba o la steam deck se apagaba por seguridad. El soporte oficial se limpia las manos y de forma oficial por email me han contestado que no soportan linux y que mejor instale Windows. Es decir no contentos con lanzar el juego con un montón de fallos en steam deck (que en teoría soportan), además toman decisiones de que sistema operativo deberías tener. En fin, de risa. Ya solo iniciar el juego es un reto mayúsculo y hacerlo funcional casi es un milagro. Espero que en las próximas actualizaciones les de por hacerlo funcional en la Steam Deck sin que se caliente como un motor a reacción, pero con la calidad que veo del juego y el equipo lo dudo mucho.

Launch menu crashes when you click the "Play" button
Same issue as the rest here, can't get to game at all.
Unable to sign into LI Pass account, getting an ID error, and then the game closes.

Launcher opens, but can't play game
Same as everyone else, once you click on Launch game, it crashes
Just the games launcher is starting, crashes instantly after clicking on button to start the actual game.
O launcher do jogo abre, mas ele não inicia.
Got to the launcher and made me make an account, but when I clicked play nothing happened at all
gamemoderun mangohud %command%