Mahjong is the national board game of China and played with 144 tiles rather than cards. It is related to the western Rummy family though it preceded them by evolving from earlier Chinese set collecting games.
It was introduced into the West in 1920 but was then changed considerably to detrimental effect. However, interest in the original classical game as played throughout mainland China was revived by a British historian and is the version we play in our group.
It is especially popular amongst Chinese senior citizens because of its positive effects on mental alertness, problem solving and memory skills. It has a bit of simple arithmetic practice as well. It's fun and exciting and, as it's played in small groups, it's very sociable too.