It's not a specific work, but more like a description of a set of rules for a game. Now we've described games as works -- see Chess, for example -- but is there really enough here to qualify as a separate work? Or is this better served as a useful note?
Pinging the other admins to weigh in: @Labster @Looney Toons @GethN7 @Robkelk @QuestionableSanity @Derivative @SelfCloak