Rules and controls
Nonograms use row and column clues to describe a hidden pattern. Each number is the length of a consecutive filled group; leave at least one empty square between groups. Choose ■ to fill or × to mark an empty square. Tap a mark again to erase it. Finish by matching every filled square to the solution; marking every empty square with × is not required.
A worked example
In a five-square row with clue 3, the group can occupy squares 1–3, 2–4 or 3–5. Square 3 belongs to every possibility, so fill the middle square. Clues 2 2 in five squares give ■■×■■.
Beginner tips
Cross-check a confirmed row square against its column clue. Use × only for known empty squares rather than guesses. Tap an incorrect mark again to clear it.
Choose a difficulty
Easy is 5×5, medium 8×8 and hard 10×10. Larger boards have more clues to cross-check. Begin with 5×5 to get comfortable separating groups with empty squares.
Questions and answers
What does a clue of 0 mean?
That row or column contains no filled squares. You may mark it with ×, but leaving a filled square there prevents completion.
Can I come back to a puzzle I started?
Yes. Progress is saved in this browser, so open the same puzzle at the same site address on the same device and browser to continue. Clearing site data or changing device, browser or domain means the existing record will not carry over.
How can I enjoy the daily challenge and practice?
The daily challenge gives everyone the same puzzle for a matching game, UTC date and level. Choose “New practice” to play another practice round at your own pace. The same round repeats its puzzle; different rounds can occasionally have the same layout.