There is also a `` -fullscreen " switch you can add via the command line that works for me. One minor issue that I didn't think warranted a separate thread - when I run this in windows from executable in my Program Files directory, settings (key bindings, mouselook etc) don't get saved on exit. I get It works fine if I instead run it from anywhere else (like from the Documents directory). So there's a simple fix but it seems a bit buggy. I figure it's to do with write permissions but I didn't have this problem with ZDoom. Other than that it's great, the portal enhancements are impressive. Cheers.