How to Use
- Set your row length to match the grid width
- Enter the clue — numbers separated by spaces, e.g.
3 1 2
- The overlap grid shows instantly which cells are definitely filled (dark), definitely empty (dot), or uncertain (light)
- Tap cells in Known cells to mark what you've already solved — filled or empty — and the arrangements update immediately
- Use Track row to save this row and work on another
The Overlap Method
For each valid arrangement, a cell is either filled or empty. If a cell is filled in every valid arrangement, it must be filled — mark it. If a cell is empty in every valid arrangement, it must be empty. The overlap grid shows this at a glance. This technique alone solves a large portion of most Nonogram puzzles.
What is a Nonogram?
A Nonogram (also called Picross, Hanjie, or Griddlers) is a picture logic puzzle. You fill cells on a grid to reveal a hidden image. Each row and column has a clue — a sequence of numbers giving the lengths of filled blocks in order, left to right or top to bottom, with at least one empty cell between each block.
Solving Strategies
- Start with rows and columns where the clue nearly fills the line — these have the most overlap
- A single clue equal to the row length means the entire row is filled
- Cross-reference row and column overlaps to mark cells definitively
- Use known cells to eliminate arrangements that contradict what you've already solved
- When only one arrangement remains, the entire row is solved