1. Touch Hu: Cards played by others can help you form an AAA form, and you can "touch" others without calling you Hu.

2. Luxurious seven decks: On the basis of ordinary seven decks, two decks are all four decks.

Data expansion:

Mahjong is a four-player domino game, which is very popular in China cultural circles. Originally from China, Guangdong, Hong Kong, Macao, Minnan and Fuzhou are commonly known as sparrows. Mahjong is a game play and entertainment equipment invented by ancient people in China. Usually made of bamboo, bone or plastic, with patterns or characters engraved on it.

Mahjong is a game invented by China in ancient times. It is a brand entertainment appliance. It is a small rectangular box made of bamboo, bone or plastic, with patterns or words engraved on it. Each pair 136 (74 in some areas) has eight more cards, namely, Mei Zhu Lan Ju in spring, summer, autumn and winter, totaling 144. The rules of the game are slightly different in different regions.

Mahjong tiles mainly include "cakes (paper money)", "strips (ropes)" and "Wan (Wan Guan)". In ancient times, mahjong was mostly made of bones and bamboo backs. It can be said that mahjong tiles are actually a combination of cards and dominoes.

Compared with other forms of dominoes, mahjong is the most complicated and interesting. Its basic gameplay is simple and easy to use, but there are many changes and the collocation varies from person to person. Therefore, it has become one of the most attractive boxing forms in the history of China.

Each deck of northern mahjong 136 cards. South Mahjong is generally 144, with eight cards in spring, summer, autumn and winter, and plum, bamboo, orchid and chrysanthemum. In some places, there are mahjong, plus 1 card of cornucopia, god of wealth, mouse and cat, and 4 cards of playing wild, totaling 152 cards.

At the same time that the horse brand was popular in the Ming Dynasty, an entertainment device called "playing cards" was also derived from the horse brand. There were 60 cards at the beginning. When playing cards, four people each take ten cards first, and then take cards and play cards in turn.

One family plays cards, and two or even three families say at the same time that the first one to get the card wins. These items and playing methods are very similar to today's mahjong tiles. This card game is always silent in the process of playing, so it is also called silent card.