The classic two player game that requires players to be on different computers. It’s also the only game that has to operate in both PowerPoint ‘Presentation’ and ‘Show’ mode.
Players could be sitting opposite each other, but of course these days could equally be communicating their moves in many other ways.
The video shows a game being played from one player’s viewpoint. It’s not a full game, but you’ll get a feel for how it works.