(Well, it does. But that's beside the point.)
Here are several Mao rules I am familiar with, from playing the game in various locations:
(What, you think I'd tell you what they all do
? You are sadly mistaken
; you'll have to read the main Mao
If any of these rules sound similar to rules of Mao you have experienced, send me a /msg - it could give some insight into the murky etymology of the game.