Dots and Boxes is a free online board game you can play instantly against a computer opponent named Otto, no download, no account, and no waiting for another player. Tap any open line between two dots to draw it. Close the fourth side of a box and you claim it — and get to go again. Whoever owns the most boxes once every line is drawn wins the match. Play through 15 levels that grow the grid from a quick 3x3 warm-up to a full 6x6 board and make Otto sharper with every match, learning to avoid handing you free boxes and, in the later levels, to sacrifice just two boxes at a time to force you into opening the next chain.
How to play Dots and Boxes
- Tap any undrawn line between two neighboring dots to draw it. Lines can run horizontally or vertically.
- If your line closes the fourth and final side of a box, you claim that box and immediately take another turn — draw as many lines as you keep completing boxes.
- If your line does not complete a box, the turn passes to Otto, who then draws a line the same way.
- The match continues until every possible line on the board has been drawn.
- Whoever claimed the most boxes when the grid is full wins. An equal split ends the match in a draw.
- Clear a level to unlock the next one, where the grid grows larger and Otto plays a sharper chain strategy.
Tips
- Avoid drawing the third side of any box unless you have no other choice — that's a free box you're handing straight to Otto.
- When every remaining line would give away a box, look for the shortest chain of connected boxes to sacrifice rather than opening a long one.
- If you can capture every remaining box in a chain, consider stopping two boxes early: draw the line that leaves both of the last two boxes open instead of completing them. Otto will scoop up those two boxes but then has to open the next chain for you.
- Early on a big grid, favor lines along the outer edge — they only ever affect one box, so they're usually safer than an interior line that touches two boxes at once.
FAQ
Is Dots and Boxes free to play?
Yes. Dots and Boxes is completely free to play online with no download, no account, and no in-game purchases.
Does Dots and Boxes work on mobile?
Yes — tap any open line to draw it, so it works on phones, tablets, and desktop with a mouse.
Why do I get another turn after completing a box?
Completing the fourth side of a box scores it immediately and grants you an extra move in the same turn — a core rule of Dots and Boxes that lets a good chain capture several boxes in a row.
What is the "double-cross" strategy Otto uses?
Instead of always grabbing every free box, a strong player sometimes leaves the last two boxes of a chain unclaimed on purpose, forcing the opponent to take those two but then be the one who has to open the next chain. Otto starts using this trick on higher levels.
How many levels does Dots and Boxes have?
There are 15 levels, growing from a quick 3x3 grid up to a full 6x6 board. Otto starts by handing out easy free boxes and gradually learns to play safe lines and sacrifice the shortest chain when forced.