In the game Domino can participate from 2 to 4 players. If a game is played by two, then they give up 7 stones, if more than 3 players - 5 stones are dealt. All the rest are put in reserve. In this version of the game, the player starts to have a double. A double is a combination of the same numbers on two fields ("1-1", "2-2", "3-3", etc.) It is forbidden to walk with an empty take (0-0). If there are no duplicates, The player who has the smallest number on two fields (0-1, 0-2, etc.). After the first move, all other participants spread their knuckles in the corresponding numbers. For example, you put a knuckle 0-2, then all the rest should put 2-1,2-2,2-3,2-4,2-5,2-6. The bones are placed with the numbers applied so that they coincide with the number of the already placed bone.