I recently discovered the Banana Ball exhibition baseball games, and their custom ruleset, featuring limitations, crowd participation mechanics and special roles among other things.
This reminded me of (and it’s an derivative game rather than an alternate ruleset) Three-Sided Football, which, among other things, is a Situationist, philosophical and sociological rabbit-hole.
I also recall dark chess, a chess variant with line-of-sight mechanics, to emulate the fog of war. There are thousands of chess variants stretching back a thousand years, this is just one of the first I learned of which really interested me.


Since most people are unbeatable at tic-tac-toe I have a variant I like to play that has nested boards. Sometimes I call it tic-tic-tac-toe-toe or nested tic-tac-toe. Here’s some shitty MS Paint to explain (red numbers indicate the board, the blue the squares on the board as they correlate to bigger board):
Rules:
It sounds confusing on paper but once you draw the board and play like 2 turns people immediately get what’s going on. It’s really funny to observers because they watch people make “obviously” bad plays on these disjointed boards and they have no idea what’s going on
I also once nerd sniped an intro programming class because I thought making this in the command line would be a fun project for one of my intro assignments. It turns out updating and printing nested python lists can get very confusing very quickly