Mao is a particularly interesting variation on chess where one plays with cards rather then a board, all the rules are secret, people need to figure them out by playing often causing complete anarachy
en.wikipedia.org
Uno is based on an open source card game.
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Damn, I completely forgot about Mao. You just unlocked a vague memory from 15 years ago. I remember being incredibly frustrated while learning this, followed by the hilarity of introducing more players to the game.
I tried it with a group years ago and we played extensively for half a year but eventually had to split off. At max i get 3 people together who know it and most plain don't like it... But good memories indeed, i still think about new rules sometimes.
I played it at a summer camp in middle or high school. We had ~25 playing one game at one point