Nonograms are pure logic — no guessing needed. Here are the key techniques to solve any puzzle.
This is the most important technique. If a clue is "7" in a 10-cell row, the filled block could start at position 1, 2, 3, or 4. The cells that are filled in ALL possible positions (cells 4–7) can be filled immediately. The bigger the clue relative to the line length, the more cells you can fill right away.
Scan the board for rows and columns with the largest clues first. A clue of "8" in a 10-cell line immediately gives you 6 filled cells. Work through all the high-value clues before attempting smaller ones.
If the sum of all clues plus minimum gaps equals the line length, the entire line is determined. For example, "3 4 2" in a 12-cell line: 3+1+4+1+2 = 11, so with 12 cells there's only one possible arrangement.
If the first clue in a row starts at the edge, you know exactly where the first group begins. If cell 1 is filled and the first clue is "3", then cells 1-3 must all be filled, and cell 4 must be empty.
Mark cells as definitely empty (✕) as soon as you can. This constrains future deductions. If a clue is fully satisfied, cross all remaining cells in that line.
Our game dims clue numbers when a row/column is fully solved. Use this visual feedback — if a row's clues are dimmed, every remaining empty cell in that row should be crossed.
After filling cells from row clues, switch to checking columns. New information from rows often resolves column ambiguities, and vice versa. Keep alternating until you get stuck, then look for more complex deductions.
Every puzzle on this site has a unique solution solvable by logic alone. If you feel like guessing, use the Check button to verify your work so far. A single error early on can make the rest of the puzzle impossible.