Hello @nightsky30, please copy your system information from steam (Steam -> Help -> System Information) and put it in a gist, then include a link to the gist in this issue report.
Found 31280 in the 2018-11-13 white list update.
I'd like to corroborate @nightsky30's experience with the game on Proton. I've had absolutely no issues on the two recent Proton versions, on my laptop's iGPU or my main PC.
This game does seem to have one tiny issue and that is there's no vsync option in the game, and the game seems to run with unlimited FPS. Can anyone confirm if this is the same behaviour on Windows?
Nothing extracted yet.
Poker Night at the Inventory and Poker Night 2 seem to be running splendidly. I've encountered exactly 0 issues.
System Info: https://gist.github.com/nightsky30/9a7078abf4346ad7225819a971e5c7f9