Each player draws tiles to make up their hand. The number of tiles drawn depends on the number of players: 2 players draw 7 tiles each 3 players draw 5 tiles each 4 players draw 5 tiles each. The remainder of the tiles make up the deck (or "stock"), and are held in or reserve to be drawn upon at need.

The first player places the first domino. The first tile down can be of any value, and need not be a double. However, the first double played, whether it is the initial tile or not, can be played off of on all four edges. This initial double is known as the spinner. All subsequent doubles can only connect on two edges.
Each player adds a domino to an open end of the layout, if he can. If a player is unable to make a move, he must draw dominoes from the boneyard until he can make a move. If there are no dominoes left, then the player must pass.
The object of the game is to make to make the open ends of the layout add up to 5 or a multiple of five (5, 10, 15, 20, etc.). The player who makes such a score receives that number of points.
At any time there may be 2, 3, or 4 open ends. When a double is first played, all of its dots count toward the total.

A hand ends either when a player plays all his tiles, or when a game is blocked, at which time the lightest hand wins total of his opponents points. All players retain the points that they have attained during gameplay, but only the winner gets the bonus points at the end of a hand.

A game is generally played to 100 points.

Each player draws tiles to make up their hand. The number of tiles drawn depends on the number of players: 2 players draw 7 tiles each 3 players draw 5 tiles each 4 players draw 5 tiles each. The remainder of the tiles make up the deck (or "stock"), and are held in or reserve to be drawn upon at need.

Each player adds a domino to an open end of the layout, if he can. Note that the layout may flow in any direction.

If a player is unable to make a move, he must draw dominoes from the deck until he can make a move. If there are no dominoes left, then the player must pass.

The player with the lightest hand (i.e. the number of dots on their dominoes) wins the number of sum total of points in all of his opponents hands. If there is a tie, the win goes to the player with the lightest individual tile.

A game ends either when a player plays all his tiles, or when a game is blocked. A game is blocked when no player is able to add another tile to the layout.

Each player draws tiles to make up their hand. The number of tiles drawn depends on the number of players: 2 players draw 7 tiles each 3 players draw 5 tiles each 4 players draw 5 tiles each. The remainder of the tiles make up the deck (or "stock"), and are held in or reserve to be drawn upon at need.

After the first player places the first domino, each player adds a domino to an open end of the layout, if he can. Note that the layout may flow in any direction, turning as necessary.
A player that cannot make a move must pass. In the block game, players may not draw tiles from the deck. The game ends when one player uses the last domino in his hand, or when no more plays can be made. If all players still have tiles in their hand, but can more no moves can be made, then the game is said to be "blocked".

The player with the lightest hand (i.e. the number of dots on their dominoes) wins the number of sum total of points in all of his opponents hands. If there is a tie, the win goes to the player with the lightest individual tile.
Game is played in a number of rounds, where the score in each individual round (or hand) is added to the score in the previous rounds. When one player's total score exceeds a pre-established "winning score" (it can be set up from the settings page), the game is over and the winner declared.

A game ends either when a player plays all his tiles, or when a game is blocked. A game is blocked when no player is able to add another tile to the layout.

If your opponent's rating is below your rating, you will gain less points in case of a win - but lose more points if he defeats you. To win or lose a fair amount of points you must play opponents having about the same rating as you.

The rating system is based on the "Elo" system developed by Prof. Arpad Elo.