The rules are similar to the game Zheng Shangyou (English: "Pits").
More specifically the game follows Pagat.com's rules for Zheng Shangyou. The rules can be found at https://www.pagat.com/climbing/shangyou.html .

However, there are following exceptions and details:

- The playing direction is clockwise.
- The Jokers are always considered as the best value cards when played in a hand. Example: hand J-Q-Joker is always considered as J-Q-K and not T-J-Q
- There are no different types of impure hands. A hand 2-7-7 is as inpure as 2-2-7 meaning that 2-7-7 cannot be played against 2-2-7, since they are equal.