This worked! Unfortunately, as I feared, this game suffers from the same multi-monitor support problems that many other Linux games suffer from. I will likely have to uninstall and move on. The game defaults to the wrong monitor, doesn't remember monitor positions when I manually move to another screen, and it generally does not like to escape the confines of its chosen monitor. A lot Linux games have this issue and I have been dealing with it for about 5 years now with no end in site. I've also worked closely with some game communities to bring this problem to greater attention. It is both a Linux issue and a game dev issue rolled into one buggy mess. If the devs are reading, is it possible to put a monitor select option into your options menu? The menu is robust and impressive, but is missing this critical feature.