Nonogram

Every picture comes out by logic

The pictures here are drawn by hand and then handed to a solver that knows nothing but the line rules. A picture it cannot finish never reaches the site, and the test suite re-solves every one of them on each build — if a picture broke, the build would stop. Five short rules are enough on all of them: the last-resort rule, the one that compares every possible arrangement, never has to run.

The hint names the rule, not the square

Ask for a hint and it does not simply colour a square in. It says which rule it used — Overlap, Gap too small, Out of reach, Line finished, Block finished — and lights the line it read. Each of those has a page of its own, so a hint you have seen once is one you can find for yourself next time.

Questions people ask

Do I ever have to guess?

No. Every picture is solved before it goes on the site, and one that line logic cannot finish is not published. Wherever you are stuck, some rule fires.

What do the numbers mean?

They are the runs of filled squares in that line, in order. A clue of 3 1 means three filled together, then at least one empty, then one filled — somewhere along the line.

Can I solve them on paper?

Yes. The printable page lays out grids with their clues in the sizes that fit a sheet.

Is the daily picture the same for everyone?

For everyone playing on the same date, yes. The picture is chosen from the date itself, so it holds for the whole day.

Does it work on a phone?

Yes. Tap to fill, switch to the cross mode to mark the squares you know are empty, and the grid scales to the screen.

If you want the details

• Rules — What the numbers mean and how one line is read
• How to play — Where to start on an empty grid
• Pictures — Every picture on the site, by size
• Printable — Grids to print and solve on paper
• Daily — One picture a day, the same one for everyone