Thanks for curating my post @benthomaswwd - yes mahjong is very popular, especially in China where it began. When I first arrived in Japan there were a lot more mahjong parlours in Hiroshima than there are now, but mahjong is still popular here too if you include online, computer and arcade players. There was a mahjong boom in the USA and UK in the 1920s too, and in recent times the Japanese version of the game has found a following in the UK.

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