"Rugby" is a very strange case. It does indeed seem to be a commercial game. My guess is that some bootlegging firm somehow got hold of a few dozen "Video Pinball" boards that "fell off the truck" and decided that instead of creating an externally obvious bootleg, they would throw the boards into cabs with custom-designed bezels and other artwork that would interact in some kinda-sorta-not-completely-insane way with the video displayed by the PCB but had an *American football* (not rugby) theme. I can't imagine that they made money on this sort of Frankenstein maneuver, but I suppose anything's possible.