Here’s an idea for a Zendo-type game which I think would work quite well on this forum: Anybody can submit koans (you don’t have to join at the beginning of the game), and there are no guessing stones. However, each person can only submit one koan per 24h period (they can also choose to guess the rule instead). At the same time each day, the GM makes a new post containing all koans so far and which ones are valid.
Anybody interested in playing this way? It would make for quite a slow and “zen”-like game.