My father had an extensive collection of Sci Am’s, and I discovered Eluesis when I was a young teen. My brother and I would play it in the back of the station wagon on the way to and from Florida, in the days before video games or personal music players. I had completely forgotten about it until now.

I’m going to teach my son to play it.

Thank you!

It’s possible to play a version of Eleusis/Zendo just with triplets of numbers where the rule is something like ‘each number is bigger than the previous’. You can do this on IRC if you have a bot with some programming ability built in: privately define a function ‘f’ which is the rule and then in the channel, everyone takes turns evaluating guesses like ‘f 2 2 5′ and occasionally guessing the rule at the person running the game.