🧩 Nonogram
Use the row and column clues to fill in the correct cells. Left-click to fill, right-click to mark empty. Solve the pattern.
Left-click: fill Right-click: mark empty On mobile: tap to fill, long-press to mark
About This Game
Nonograms are pure constrained deduction. Every clue restricts which cells can be filled, and the puzzle is solved by intersecting restrictions until certainty appears. Nothing is ever guessed in a well formed nonogram, which makes it unusually honest as a logic puzzle.
That deductive work is reasoning in the formal sense, the ability trained directly in the NIH-funded ACTIVE trial, a randomised study of 2,832 older adults in which reasoning training produced measurable gains that were still present years later.
Finishing a puzzle with no errors and no hints is the standard worth aiming at. Speed comes later and matters less.
The tip most people miss: mark the empty cells. Beginners only fill squares they are sure about and leave everything else blank, which means blank carries two meanings at once, unknown and confirmed empty. Marking confirmed empties with a cross turns each of them into a fresh constraint. Most stalled nonograms are not short of information, they are short of recorded information.
How to Play Nonogram
Each row and column has a series of numbers as clues. These numbers tell you the length of each group of consecutive filled cells in that line. For example, a clue of "3 1" means there is a group of 3 filled cells, then a gap, then 1 filled cell in that order.
Left-click to fill a cell. Right-click to mark a cell as definitely empty (shown as X). Use logic to deduce which cells must be filled based on overlapping possibilities. If a row clue is "5" on a 5-cell row, every cell must be filled.
Solving Tips
Start with the largest clues relative to the grid size. These have the fewest possible positions. A clue of "4" in a 5-cell row must occupy at least cells 2 through 4, whatever the exact placement. Cross-reference row deductions against column deductions to progressively narrow down the solution. Completed clues (matching the grid state) dim automatically to help you track progress.
Frequently Asked Questions
What do the numbers mean in a Nonogram?
What does right-clicking do?
Can Nonograms have multiple solutions?
What size should I start with?
Try These Next
How Do You Play Nonogram?
Numbers along each row and column tell you the lengths of the filled blocks in that line, in order. Use those clues to work out which cells are filled and which are blank. Click to fill a cell and click again to mark it as definitely empty. The puzzle is solved when every filled cell matches the clues, revealing a small picture.
Marking known blanks is as important as marking fills, because eliminating a cell often forces the answer in a crossing line.
What Are the Cognitive Benefits of Logic Puzzles?
Nonograms are pure deductive reasoning under constraint. Each clue narrows the possibilities in one line, and progress comes from intersecting two partial deductions rather than from guessing.
Practice of this planning and deduction kind is examined in research indexed by the National Library of Medicine.
The honest caveat is that gains are largely specific to the skill you practise. Research on cognitive training transfer found that transfer to unrelated tasks is real but usually modest, so treat these as focused practice rather than general brain training.
Tips to Improve Your Nonogram Score
Start with the longest clues, since a clue close to the line length leaves the fewest arrangements. Mark definite blanks aggressively; they constrain crossing lines as much as fills do. Work the intersections between a nearly solved row and a nearly solved column. If you find yourself guessing, stop and re-scan for a line you can settle with certainty instead.
Why do I need to mark empty cells?
Because eliminating a cell constrains the crossing line as much as filling one does. Players who only mark fills stall on puzzles that are solvable, since half the available deductions come from the cells you can rule out.