Hello @lennie420, this looks like the line of interest in the log:
Unhandled Exception:
System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Xna.Framework.Game, Version=3.1.0.0, Culture=neutral, PublicKeyToken=6d5c3888ef60e27d' or one of its dependencies.
Obfuscated with SmartAssembly, won't work in Wine Mono currently. :(
Tested the demo version with the latest proton Experimental on steam deck and the game still will fail to boot unless you use proton 3.16-9.
Hello @waspennator, please open a new compatibility report for the demo variant of this game.
This games crashes with recent Proton versions (Experimental (2024/07/31), 9.0-2, 8.0-5, ....). It works with Proton 3.16.
Proton logs: steam-212030-kungfu.tar.gz
Specs:
This game is still crashing with recent Proton versions (Proton 10 (beta-1d) and Experimental (2025-05-08)), but at least the error lines have changed...
Unknown heap type: #GUlD
Unknown heap type: #Blop
* Assertion at /builds/mono/wine-mono/wine-mono-10.0.0/mono/mono/metadata/object.c:4679, condition `is_ok (error)' not met, function:prepare_run_main, (null) assembly:Z:\home\gamer\.local\share\Steam\steamapps\common\Proton - Experimental\files\share\wine\mono\wine-mono-10.0.0\lib\mono\4.5\mscorlib.dll type:TypeInitializationException member:(null)
Proton logs: steam-212030-proton-exp.tar.gz
Specs:
Still failing the same with latest proton Experimental
proton experimentalx3 2026-05proton 3.16x1 2024-08proton 3.16-9x1 2023-05prime-run %command%x1 2021-05mscorlib.dllx1 2025-05
Compatibility Report
System Information
I confirm:
Symptoms
Game installs and goes through initial setup process but doesn't launch. This also happens when not using prime-run %command%.
I noticed that on ProtonDB (https://www.protondb.com/app/212030) there are reports of version 3.16 working with the game. I have confirmed this and funny enough once I install the game with this version I am then able to launch the game with Proton Experimental. The game had some heavy freezes while playing but was able to still launch and continue an old save of the game from Windows when I played a few years ago.
Reproduction
Install and launch game.
steam-212030.log