Logic puzzles
A nonogram hides a picture behind numbers. Each row and column lists the runs of filled cells it contains, and you work out where they go. No single line gives enough to finish it. The answer comes from playing rows and columns off each other, one certain cell at a time.
Every puzzle here is checked by a solver before you see it. It keeps only grids with exactly one answer that can be reached one line at a time, so a guess is never needed. Four moves below the game do most of the work.
Click to fill · right-click or long-press to cross · drag along a line · arrows and space on a keyboard, x to cross
Daily puzzle
The numbers beside each row and above each column are the runs of filled cells in that line, in order, with at least one empty cell between runs. Fill the grid so every line matches. Today's 5×5 is the same for everyone, and there is exactly one answer.
- Best
- …
- Daily streak
- …
Random puzzles count toward your best times, not the daily streak.
Best times
Loading your times…
| Size | Unaided | With checking |
|---|---|---|
| 5×5 | – | – |
| 10×10 | – | – |
| 15×15 | – | – |
Four moves that solve most lines
- 1
Fill the overlap
A run of 7 in a line of 10 can start anywhere from the first cell to the fourth. Wherever it sits, it covers cells 4 to 7, so fill those now. In general, a run longer than half its free space always covers its middle. Add up the runs and the gaps between them first: a clue of 3 2 4 needs 11 cells, which leaves 4 cells of slack in a line of 15, and any run longer than 4 has an overlap.
- 2
Work from the edges
A filled cell near the border pins down the first run. If a row starts with a 3 and its second cell is filled, the run begins at the first or second cell, so the third is filled too. A cross near the border pushes the run inward the same way.
- 3
Cross out what's finished
When a line's runs are all placed, every other cell in it is empty. Cross them. The clue dims when a line's filled cells match it, which is your signal to do this. Crosses are information for the crossing lines.
- 4
Switch direction
Every cell you settle in a row is a new fact for its column. When a row runs dry, go down the columns that changed and look again. The puzzles here are built so that this back and forth always finishes the grid. You never need to guess, and a guess that seems necessary means a deduction was missed.