There are 13 cards in hand. The purpose is to combine the cards into four pairs of cards and one pair. This pair is the same. The card type consists of three consecutive cards (such as 123000, 456, seven tubes, eight tubes and nine tubes) or three identical cards (such as three-five, three-east, etc.). If you count carefully, you should find that the card is 6544.

Different places play mahjong in different ways. You can find a friend to play mahjong. It's very simple. It's still the next game "Three Stars Missing One", which also has instructions. You can play it.