Dots and Boxes Rules
Learn how turns, completed boxes, scoring, extra turns, board sizes, and the end of a Dots and Boxes game work.
Dots and Boxes is played by drawing one line at a time between neighboring dots and claiming any square completed by your move. The essential rule is that completing a box gives you another turn, so a single scoring move can sometimes lead to a sequence of additional moves.
This guide explains the standard gameplay rules, including legal moves, box completion, extra turns, scoring, board dimensions, and how a game reaches its conclusion.
What You Need to Play Dots and Boxes
A standard game needs:
- A grid of evenly spaced dots
- At least two players
- A way to draw or select lines between neighboring dots
- A way to identify which player owns each completed box
On paper, players traditionally use a pencil or pen and mark completed boxes with their initials or a distinctive symbol. Online, the board and box ownership are handled digitally.
A game can be played on different board sizes. The number of dots determines how many potential boxes exist between them. For example, a grid containing 4 dots across and 4 dots down creates a 3-by-3 arrangement of boxes.
How a Turn Works
Players take turns drawing one horizontal or vertical line between two adjacent dots.
A legal move connects dots that are directly next to each other. Diagonal lines are not part of the standard game.
If the line does not complete a box, the move ends your turn and the other player plays next.
If the line completes a box, you claim that box and take another turn immediately. You do not have to wait for your opponent.
This extra turn continues for every subsequent move that completes another box. As a result, one turn can sometimes contain several scoring moves.
How to Complete and Claim a Box
A box is completed when its four sides have been drawn.
You claim a box by drawing the line that creates its fourth side. It does not matter who drew the other three sides. The player who draws the final side owns the completed box.
For example, suppose three sides of a square are already present. If it is your turn and you draw the missing fourth side, you claim that square and score one point.
You then take another turn because you completed a box.
This rule also means that you can sometimes claim a box largely created by your opponent. Ownership is determined by who completes the fourth side, not by who drew most of the lines around it.
What Happens When One Move Completes Two Boxes?
A single line can sometimes complete two boxes at the same time.
This happens when the line being drawn is shared by two adjacent squares and both squares already have their other three sides.
In that situation, the player who draws the shared line claims both boxes and receives another turn.
The player does not receive two separate extra turns. Completing two boxes with one line still gives one additional turn.
This is one of the reasons the position of a shared edge can become important as the board fills.
How Scoring Works
Each completed box is worth one point.
The score is therefore simply the number of boxes each player has claimed.
For example, if a game finishes with 9 boxes for one player and 7 for the other, the final score is 9–7 and the player with 9 boxes wins.
On a larger board, the same scoring system applies. There is no special value assigned to a particular box based on where it appears on the board.
The total number of boxes depends on the dimensions of the dot grid. A grid with rr rows of dots and cc columns of dots contains:
So a 5-by-5 grid of dots contains 16 boxes, while a 6-by-6 grid of dots contains 25 boxes.
When Does the Game End?
The game ends when every possible line between neighboring dots has been drawn and every box on the board has been claimed.
There are no unused moves left at that point.
The players then compare their scores. Whoever has claimed more boxes wins.
A tie is possible when the board contains an even number of boxes and both players finish with the same number. Standard Dots and Boxes does not require a special tiebreaker unless a particular version of the game introduces one.
What Happens After You Complete a Box?
Completing a box does not end your turn.
You immediately make another move.
This is one of the most important rules to understand before playing because it creates sequences of scoring moves. If your next move completes another box, you receive another turn again.
Once you make a move that does not complete a box, your turn ends.
The extra-turn rule is also what gives Dots and Boxes much of its strategic depth. A player may eventually be able to collect several connected boxes in succession rather than scoring only one point at a time.
Are You Allowed to Pass?
Under the standard rules, no.
If it is your turn, you must make a legal line move when one is available. You cannot simply skip the turn to make your opponent play instead.
This matters particularly late in the game. As more sides are drawn, the number of available moves that avoid completing a box can become very small or disappear completely.
Some digital or house-rule versions may handle turns differently, but those should be treated as variations rather than part of the standard rules.
Want to see how different versions change the game? Explore Dots and Boxes variations.
What Counts as a Legal Move?
A legal move in standard Dots and Boxes:
- Connects two neighboring dots.
- Uses a horizontal or vertical line.
- Draws a line that has not already been drawn.
- Is made during the player’s turn.
A move cannot connect non-adjacent dots, cross the board diagonally, or redraw an existing line.
On a digital board, the game normally prevents invalid selections automatically.
What Happens When There Are Several Boxes Available?
You choose which legal line to draw.
If several moves are available, you are not required to complete a box simply because one is available. You can choose another legal line instead.
Once you draw a line that completes a box, however, that box is yours and the extra-turn rule applies.
This distinction is useful because the rules determine what happens after a move, but they do not generally require you to choose a particular legal line. Your choice of move is where strategy enters the game.
How Board Size Is Described
Dots and Boxes boards can be described in two related ways: by the number of dots or by the number of boxes.
For example, a 5-by-5 grid of dots creates a 4-by-4 arrangement of boxes.
This distinction is worth checking whenever a board size is given because different resources may use different conventions. A description such as “5 × 5” can refer either to five rows by five columns of dots or to five by five boxes, depending on the convention being used.
For clarity, it is best to specify whether a dimension refers to dots or boxes.
Can More Than Two Players Play?
The traditional game is generally presented as a two-player pencil-and-paper game, but Dots and Boxes can also be adapted for more players.
With multiple players, the same basic mechanics can be retained: players draw lines, claim completed boxes, and receive another turn after scoring. The exact turn order and scoring experience can depend on the version being played.
If you are playing the standard two-player form, the basic rules above are all you need.
Different rule sets and board arrangements are explored separately in our Dots and Boxes variations guide.
A Few Rule Details Worth Remembering
Some details are easy to overlook when learning the game. A line belongs to the shared board rather than to the player who draws it, so the fourth side of a box determines who claims it. A shared line can complete two neighboring boxes at once, but that still produces one additional turn rather than two. It is also useful to state board dimensions clearly because a grid can be described by its dots or by the boxes between them.
Most importantly, choosing a legal move and completing a box are two different things. You are free to select another legal line when a scoring opportunity exists, but once your chosen line completes a box, you claim it and continue your turn.
Rules Versus Strategy
Knowing the rules tells you what you are allowed to do. It does not tell you which legal move you should make.
That distinction becomes important as the board fills. Early moves may leave several harmless options, while later positions can force a player to give an opponent access to one or more boxes. Because completing a box also gives another turn, the consequences of a move can extend well beyond the single line being drawn.
That is the point where Dots and Boxes becomes a strategic game rather than simply a matter of completing squares.
If you want to move beyond the rules and learn how those positions can be handled, continue with how to win Dots and Boxes .
