Hitori Generator
Creates hitori puzzles: shade some cells of the number grid so that no number appears more than once in any row or column among the unshaded cells — while shaded cells never touch horizontally or vertically and the unshaded cells stay connected as one area. The generator builds a valid shading pattern, fills in the numbers and verifies with a solver that only one shading works. Solve on the page by clicking cells, with checking and hints, print, or export PNG/SVG.
Runs 100% in your browser — your puzzles never leave your device.
Read the full guide to this tool
Notes
- Rules: shaded cells may not share an edge, every unshaded number must be unique in its row and column, and all unshaded cells must remain connected edge-to-edge.
- Every puzzle is verified with a backtracking solver to have exactly one valid shading before it is shown.
- Difficulty controls how many cells must be shaded: harder puzzles hide more duplicates and need longer deduction chains.
- Runs 100% in your browser — your words and puzzles never leave your device.
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