Go (game)
Go is an abstract strategy board game for two players, in which the aim is to surround more territory than the opponent. The game was invented in China more than 2,500 years ago and is believed to be the oldest board game continuously played to the present day. 
A 2016 survey by the International Go Federation's 75 member nations found that there are over 46 million people worldwide who know how to play Go and over 20 million current players, the majority of whom live in East Asia.
Play-by-mail game
Correspondence chess has been played by mail for centuries. The boardgame "Diplomacy" has been played by mail since the 1960s, starting with a printed newsletter (a fanzine) written by John Boardman. More complex games, moderated entirely or partially by computer programs, were pioneered by Rick Loomis of Flying Buffalo in 1970. The first such game offered via major email services was "WebWar II" (based on Starweb and licensed from Flying Buffalo) from Neolithic Enterprises who accepted email turns from all of the major email services including CompuServe in 1983.