Nonogram
Also known as paint by numbers, picture logic puzzles, Japanese crosswords or simply nonograms. Nintendo’s Picross and Conceptis’ Griddlers are the same genre of puzzle.
Free online Nonogram: fill the squares each row and column's numbers describe, and a hidden picture appears. Every puzzle we generate is checked by an independent solver — it has exactly one solution, reachable step by step with line logic alone, never by guessing. Drag to fill a run, mark the gaps, and keep your daily streak going.
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Single solution — solvable by logic alone ✓
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How to play Nonogram — the rules
- The numbers beside each row and above each column give the lengths of the filled runs in that line, in order. A clue of 3 1 means a run of three filled squares, then a gap, then one more filled square.
- Tap or click a square to cycle it: empty → filled → marked-empty (✗) → empty. Use ✗ to note squares you have proven are blank — it keeps long lines readable.
- Drag across several squares to fill or mark a whole run at once. Pick the Fill or ✗ tool for what a drag paints; long-press (or right-click) uses the other one for a single square.
- A line is done when its filled runs exactly match its clue. As you go, satisfied clues fade and cross out, so you can see your progress at a glance.
- You never have to guess. Every puzzle is verified to have one solution reachable by logic alone — if you are stuck, re-read a crossing line and a forced square will appear.
Keyboard: arrow keys to move around the grid, Space or Enter to cycle a square, X to mark it empty.
Our guarantee, honestly kept: every puzzle is checked by an independent line-logic solver before it reaches you. It confirms the picture has exactly one solution and that pure line-by-line deduction — no guessing, no backtracking — is enough to complete it. Puzzles that fail either test are rejected and regenerated.
Strategy and tips
Frequently asked questions
Are these nonograms always solvable without guessing?
Yes. Every puzzle is generated together with an independent line-logic solver that must fill the whole grid using row-and-column deduction alone — no guessing and no trial-and-error. Puzzles it cannot finish that way are thrown out and regenerated, so a logical next step always exists.
What do the numbers in a nonogram mean?
Each number is the length of one run of consecutive filled squares in that row or column, listed in order — left to right for rows, top to bottom for columns. Runs are separated by at least one empty square, so a row clue of 4 2 means four filled, a gap, then two filled.
Does every nonogram have only one solution?
Here, yes. Before a puzzle is served, the solver proves it has exactly one solution — that is part of our check. Random grids elsewhere can have several solutions; ours never do, so the picture you uncover is the one that was intended.
What is the ✗ mark for?
The ✗ marks a square you have deduced must be empty. You do not need it to win — only the filled squares are checked — but marking known gaps is the core technique for reading a line and saves you from re-checking the same squares.
Is the daily nonogram the same for everyone?
Yes. Each day one 10×10 puzzle is generated from a public seed and everyone worldwide gets the same picture, with the same verified single solution — rolling over at midnight in your local time zone. Solve it to keep your streak alive.