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Windows 10 support quietly extended until Oct 2027, as users reject Windows 11
(www.windowslatest.com)
this post was submitted on 25 Jun 2026
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You may need to limit the number of cores you're giving the game. According to Proton DB, it's got a gold rating on Linux
https://www.protondb.com/app/799600
I'd try adding
--cores 4to your launch options and reducing it from there if you have issues still. Also seems like Proton 10.0-3 is the ideal version.If you need assistance getting those setup:
In your steam library, right click on Cosmoteer in your games list and click on
propertiesUnder Compatibility, make sure
Force Use of Specific Compatibility Toolis checked. SelectProton 10.0-3as your Proton version. If you haven't used that version on a game before, it may need to download and that'll take a bit, which is why I'm having you do this first.Under the first section in properties (I'm typing this all from memory, apologies), there should be a section that says
launch options. In that text box, type%command% --cores 4Launch the game. If it works, great! If not, try reducing the number after
--coresin your launch options to2. If it continues not working, try switching to Proton experimental. If it continues not working, I'm out of ideas unfortunately.I'll give it a shot. I figured the game would work, i just haven't dug under the hood to figure out why not.