From the author of John's Chess Program (
https://www.nextcomputers.org/forums/index.php?topic=5450), here's a two cube setup running a connected game of Maze War. He also has one of the nicest repainted NeXTcubes that I've seen.
http://www.johnmiranda.com/next.htm (
http://www.johnmiranda.com/next.htm)