How to Play Dots & Boxes

Dots & Boxes is played on a grid of dots. The default board is a 5x5 grid of dots, forming a 4x4 grid of potential boxes (16 boxes total).

The board starts completely empty -- no lines drawn, no boxes claimed. Player 1 always goes first.

Players take turns drawing a single line between two horizontally or vertically adjacent dots.

On your turn, click between two adjacent dots to draw a line. Lines can be horizontal or vertical but never diagonal.

Each line connects exactly two neighboring dots. Once drawn, a line stays on the board permanently.

Here a few lines have been drawn. Player 1 drew the first two lines (top-left area) and Player 2 responded with two lines nearby. Notice that no box is completed yet -- each box requires all four of its sides.

When you draw the fourth and final side of a box, you claim that box and score a point. Your initial is placed inside it.

Bonus rule: Completing a box earns you an extra turn. You must draw another line immediately. This is a key part of the strategy.

In this position, box (0,0) has three sides drawn. Player 1 can draw the remaining right edge to complete it, score a point, and take another turn.

Because completing a box gives you an extra turn, you can sometimes complete multiple boxes in a row -- this is called a chain.

If completing one box leaves another box with only one side remaining, you can complete that box too on your bonus turn, scoring again and getting yet another extra turn.

Here Player 1 has just completed box (0,0) and earned an extra turn. Box (0,1) also has three sides drawn, so Player 1 can complete it immediately, claiming two boxes in a single sequence of turns.

In Dots & Boxes, a key strategy is knowing when to sacrifice a small number of boxes to gain a larger chain later.

If you complete a long chain of boxes, your opponent may get nothing. But sometimes you must deliberately give up 2 boxes in a short chain so that your opponent is forced to open a longer chain for you.

Here it is Player 2's turn. The two boxes in the top-left each need one more line. If Player 2 completes them, they score 2 but then must draw a line elsewhere, potentially opening the larger chain on the right for Player 1. Advanced players think several moves ahead about which chains to take and which to sacrifice.

Play on different grid sizes from 2x2 (quick) to 6x6 (strategic). Larger boards have more boxes to claim.

A 2x2 grid has only 4 boxes and ends in just a few moves — great for learning. A 6x6 grid has 36 boxes with far more chains and sacrifices to consider.

Here is a 3x3 grid (4x4 dots, 9 boxes). Some lines have already been drawn. Notice how the smaller board still offers strategic depth with chains and sacrifice opportunities.