Take turns drawing a line between two dots that sit next to each other, across or down.
- Close a box by drawing its fourth side. It’s yours: your mark goes in.
- Go again. Closing a box means you must draw another line. One line can close two boxes at once.
- Otherwise the turn passes to the other player.
When every line is drawn, the player with more boxes wins. On a 4×4 board, eight boxes each is a draw.
Tip: try not to draw the third side of a box. Your opponent can close it and go again.
Keyboard: arrow keys move between lines, Enter or Space draws. Ctrl+Z undoes.