Naú tín kau, literally "turning heavens and nines," from the names of the highest pieces of the 2 suits, is played by 2 persons.

One set of dominoes are used, which are piled face down in a stack 4 high. The first player draws the top domino from the end of the stack toward his right, and the second player the one beneath it. The second player must draw a higher domino of the same snit, either man or mò or the first player takes both pieces and places them on the table before him, with the face of the winning piece exposed on top.

The winner continues drawing first until the other player draws a higher piece, when the latter takes both pieces and has the lead. The game is continued in this way until the stack is exhausted.

Each of the players then counts the red spots on the exposed faces of the dominoes before him and the one having the highest total becomes the winner, and is paid for each red spot he has in excess by the loser.