I admit, it doesn’t really have anything to do with math, but it looks like a fun way to spend a snowy afternoon:
According to the authors:
Jet black ink should be used, and a good quality of unglazed paper. The ink should not be too thin. The table should be protected from accident with several thicknesses of newspaper. . .
For a specially invited Gobolink party the company may dress in any grotesque fashion, remembering only that both sides of their costume shall be the same, this being a feature peculiar to Gobolink attire.
Rules of the Game
(Click for an enlarged image that is clearer to read.)