Guide

How to Solve Nonograms

Practical tactics that work on almost every nonogram, from beginner grids to larger boards.

ContentsStart with the longest clues Use overlap logic Mark empty cells with X Check rows against columns Beginners: start on small grids Move on when a line stalls

Start with the longest clues

Look for the biggest number in each row and column. Long runs have less wiggle room, so you can often fill the guaranteed centre cells before touching anything else.

Use overlap logic

If a run of 6 has to fit into a 10-cell line, imagine it pushed all the way left, then all the way right. The cells covered in both positions must be filled — that's overlap logic, and it's the most useful technique in the game.

Mark empty cells with X

Whenever you prove a cell must be empty, mark it. X marks keep the finished work visible and stop you from accidentally filling a cell you've already ruled out.

Check rows against columns

When a row gives you new filled or empty cells, re-read the matching columns. Each update opens new deductions, and the puzzle solves line by line until the picture is complete.

Beginners: start on small grids

If you're new, begin with 10x10 boards on easy difficulty. Small grids teach the exact same techniques as large ones, but the solve fits into a few minutes and mistakes are quick to undo. Step up to 15x15 and 20x20 once the rhythm feels natural.

Move on when a line stalls

When a row or column stops giving new information, switch to a different line instead of guessing. You'll almost always return to the stuck line later with a fresh cell that breaks it open.

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