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Both of the widely played Guangdong and Hong Kong variants are here: gai ping wu and tui dao wu, which differ in how you may win and how faan are counted.
What to know about this ruleset
Two presets
Gai ping wu allows chow and winning on a discard; tui dao wu allows only self-draw and robbing-the-kong wins.
Faan-based scoring
Scores are built by multiplying the faan attached to each pattern, as in Guangdong play.
An eleven-part tutorial
Learn everything from tile basics to faan counting by playing through it hand by hand.
Frequently asked questions
What separates gai ping wu from tui dao wu?
Gai ping wu allows chow and winning on another player’s discard; tui dao wu has no chow and recognises only self-draw and robbing-the-kong wins. You choose before the game.
Is this the same as Hong Kong mahjong?
No. Hong Kong mahjong (HKOS) is a separate branch with 144 tiles including eight flowers, a three-faan minimum, a 13-faan cap and full-chung payment, so it is offered as its own preset inside the Guangdong family alongside gai ping wu and tui dao wu.
I have never played before.
A dedicated eleven-part Guangdong tutorial takes you from tile basics through to faan counting.