What the numbers mean
A clue like 4 means there is one run of four filled cells in that row or column.
A clue like 2 1 means two filled cells, then at least one empty cell, then one filled cell.
What counts as a safe move
A safe move is a fill or X mark that must be true in every possible placement of the clue.
Good nonogram solving alternates between rows and columns as each mark creates new evidence.
Why Calm Nonogram Coach helps
The app highlights the next logical place to look and explains why the move is safe, so beginners learn the pattern instead of copying an answer.
Practice this in the app
Practice the rules in Calm Nonogram Coach with guided beginner boards.