Pai Sho (牌數) is a two-player game that is popular throughout the World of Avatar, appealing to people of all ages. Dating back to the era of Raava, legend has that it was invented by the spirits, and the game has remained popular among people all over the world since that time. It is a game of both strategy and chance, with each culture having developed its own rules and variations of the game. Prior to the group's existence being publicly revealed at the end of the Hundred Year War, the Order of the White Lotus used Pai Sho to identify its members by forming a lotus flower with the tiles.