In the print dialog choose A4 and leave the scale at 100%, or the squares come out a different size.
Four boards, 10 × 10 crossings
Take turns placing dots on the crossings. When your dots surround your opponent's with a closed line, draw round them — that ground is yours and is out of play. Whoever surrounds more when the paper is full wins.
4 identical grids share the page, arranged two across and two down, each one a 10x10 lattice with 9.2 mm between neighbouring crossings. Dots go on the intersections rather than inside the squares, so what you are counting is the 10x10 crossings themselves. The rules sit above the grids and a row for both names and a running total sits below them, which is everything a game needs once the sheet leaves the internet.
Take this one if you want several quick games rather than a single long one. A 10x10 grid fills up in roughly ten minutes, so a single page keeps two people busy for the better part of an hour, and you can cut it into quarters and hand a board to somebody else. It is also the friendlier introduction: fewer crossings means a beginner can see the shape of a surrounded region before it becomes complicated, and a child learning the game is not staring at four hundred intersections wondering where to begin. Fold it once and it slips into a jacket pocket.
Choose A4 and leave the scale at 100%. Any other value shrinks the drawing, and a square that should measure 9.2 mm comes out smaller — which matters, because these boards are sized for a real pencil rather than for a screen. Ordinary 80 gsm copier paper is enough; anything heavier resists a fold. If your dialog offers “fit to page”, switch it off, then check the printed square against a ruler before you start playing.