Make a coloring page
Pick a style and a difficulty. Every press gives you a design nobody has printed before, measured as it is made — if a candidate has an area too small to color, it is thrown away before you ever see it.
Press New design.
Generated pages print best on plain 80–100 gsm paper — and pencils matter more than paper.
What we'd use.
What "checked" means here
The same test that gates the published pages runs in your browser before a design is shown: the artwork is rasterised at print size, every enclosed area is found, and the largest circle that fits inside the smallest one is measured. Below the difficulty's rule, the design is discarded and another is generated. It usually takes one attempt and occasionally a few, which is why the button can take a moment on the intricate settings.