You are likely thinking of the game https://en.wikipedia.org/wiki/Nomic https://en.wikipedia.org/wiki/Nomic, which happens to be very well-suited for online pl

You are likely thinking of the game https://en.wikipedia.org/wiki/Nomic https://en.wikipedia.org/wiki/Nomic, which happens to be very well-suited for online play. Two of the largest instances are https://agoranomic.org/ https://agoranomic.org/ and https://blognomic.com/ https://blognomic.com/