Can I solve without X marks?

Sometimes on tiny puzzles, but X marks make larger puzzles much safer and clearer.

Should I mark every empty cell?

Mark cells when they are proven empty or when a line/group is complete.

Nonogram guide

X marks are confirmed empty cells in nonograms. They are essential for preventing accidental fills and solving without guessing.

Quick answer

An X mark means a cell is confirmed empty. It is just as important as a filled square because it limits where clue groups can go.

Search intent: Specific beginner question with high likelihood of App Store search/support crossover.

Many beginners think only filled cells matter. In nonograms, confirmed empty cells are part of the solution evidence.

Place X marks around completed clue groups and in cells that cannot belong to any legal placement.

A Fill/X/Erase tool picker prevents accidental three-state cycling, which can turn a correct filled cell into an X with one stray tap.

Practice safe X marks with a protected nonogram input system.