How to solve nonograms
Read row clues from left to right and column clues from top to bottom. Each number describes a consecutive run of filled cells.
1. Read the order of the runs
Read row clues from left to right and column clues from top to bottom. Each number describes a consecutive run of filled cells. A clue of 2 1 calls for a run of two followed by a run of one. In a single-color nonogram, at least one empty cell must separate them.
2. Find fully determined lines
On a five-cell line, a clue of 5 fills the entire line. A clue of 2 2 also fixes all five positions: two filled, one empty and two filled, shown as ■■×■■. A clue of 0, when used, means the line has no filled cells.
3. Use overlapping positions
A clue of 4 in a five-cell line can occupy positions 1–4 or 2–5. Both placements share positions 2, 3 and 4, so fill those three without deciding the endpoints. The rule confirms cells common to every possible placement, not the entire run.
4. Cross-check rows and columns
Every filled cell in a row affects its column clue. After completing a line, inspect its crossings. Once a run has its exact length, mark spaces that must stay empty beside it. Keep confirmed empty cells distinct from cells that are still unknown.
5. Correct without guessing the picture
If a line can no longer contain its runs, review the latest deduction affecting it. Do not add cells merely to make the image resemble an object. A theme can help you observe the finished result, but clues determine each cell’s state.
6. Check runs and color
Count the actual runs in every row and column in order and compare them with the clues. In color versions, each clue gives length and color; check the key. Usually, differently colored runs may touch, while consecutive runs of the same color need separation. That difference changes the deductions available.