The game may be played in partnership when there are 4 players.
Number of dominoes drawn: If 2 play, each player draws 7 tiles. If 3 or 4 play, each player draws 5 tiles.
The tiles not drawn are pushed to one side to make up the boneyard.
Set: Lots are drawn to determine who sets the first tile. The first player may play any domino in his hand. After the first tile has been set, play continues to the left.
      
How to Play: After the first domino is set, subsequent players must join a tile from their hand with an open end in the line of play. The ends of the two tiles that are joined must have the same number of pips.

If a player is unable to make a play from his hand, he must draw tiles from the boneyard until he draws a playable tile. If a player is unable to make a play from his hand and there are no tiles left in the boneyard, the player must skip his turn until he is able to make a play.

Scoring: A player scores 1 point per pip when the total number of pips on the exposed ends of the tiles in the layout is a multiple of 3 or a multiple of 5. If, after making a play, the total number of pips on the exposed ends of the tiles in the layout total 10, which is a multiple of 5, that player would score 10 points. If the total number of pips was 12, which is a multiple of 3, that player would score 12 points. If the total number of pips was 30 a multiple of 3 and a multiple of 5, that player would score 60 points (30+30).

The game is over when one player has doniinoed or when the game is blocked. Once the game is over, each player should count the total number of pips on the remaining tiles in his hand. The player who dominoed or the player left with the lowest number of pips in his hand at the end of the game is the winner. 

The winner earns a score of the total number of pips left in his opponents' hands (1 point per 1 pip).
The game is usually 251 points.

Variations: 1) No more than 4 can play, and every player, regardless of the number of players, draws 7 tiles. 2) If 4 play, each draws 5 tiles; if 3 play, each draws 6; and, if 2 play, each draws 7.

Variation: The player holding the highest double in his hand makes the first play by setting that tile. After the first tile has been set, play continues to the left.

The first double played is a spinner.
Variation: There are no spinners.
Variations: 1) When there are 2 players, the last two tiles in the boneyard may not be drawn. If there are 3 or 4 players, the last tile in the boneyard may not be drawn. 2) If a player has a playable tile, he must play it. 3) A Player may draw from the boneyard even if he holds a playable tile in his hand.