This game is based on the rules of XueZhan mahjong of Chengdu, China, which been proposed by Chengdu local developer.
All the special rules of Xuezhang mahjong are supported, such as XueZhan (players who still not win can continue play the game until only left one player or haven't tiles), added glory to a gong, robbing a gong, must lack suit, self drawn award, etc.