mahjong jpJapanese mahjong (Japanese: , Hepburn: Mājan), also known as riichi mahjong (, rīchi mājan), is a variation of mahjong. While the basic rules to the game are retained, the variation features a unique set of rules such asJapanese mahjong (Japanese: , Hepburn: Mājan), also known as riichi mahjong (, rīchi mājan), is a variation of mahjong. While the basic rules to the game are retained, the variation features a unique set of rules such as