Both widely played Guangdong rule sets are here — Jipinghu (gai ping wu) and Tuidaohu (tui dao wu), which differ in how you may win and how faan are counted — with Hong Kong Old Style offered as a separate preset.
Jipinghu allows chow and winning on a discard; Tuidaohu allows only self-draw and robbing-the-kong wins.
Jipinghu adds up the faan of every pattern and pays the base score × 2 to the power of the faan (a chicken hand of 0 faan can still win; ordinary hands stop at 3, big hands reach 6); Tuidaohu multiplies its win multipliers.
Learn everything from tile basics to faan counting by playing through it hand by hand.
Jipinghu (gai ping wu) allows chow and winning on another player’s discard; Tuidaohu (tui dao wu) has no chow and recognises only self-draw and robbing-the-kong wins. You choose before the game.
No. Hong Kong mahjong (HKOS) is a separate branch with 144 tiles including eight flowers, a three-faan minimum, a 10-faan cap and full-chung payment, so it is offered as its own preset inside the Guangdong family alongside Jipinghu and Tuidaohu.
A dedicated eleven-part Guangdong tutorial takes you from tile basics through to faan counting.