Click any cell to shade it (dark) or unshade it. Three rules must be satisfied:
1. No repeats unshaded: In every row and column, no number may appear more than once among the unshaded cells.
2. No touching shaded cells: Two shaded cells may never share an edge (diagonal is fine).
3. All unshaded cells connected: Every unshaded cell must be reachable from every other unshaded cell by moving horizontally or vertically through unshaded cells.
Right-click or long-press to place a circle dot — use these as notes to mark cells you're certain should NOT be shaded. Hitori was popularised by Nikoli (Japan).
Shade cells so no number repeats in a row or column, shaded cells never touch, and the rest stay connected.
The full guide, with a worked example and common mistakes: How to play Hitori.
It places a circle — a note that a cell must stay unshaded. Long-press does the same on a phone or tablet.
No — the unshaded cells must be connected. Shaded cells must not touch at all.
Enter the numbers in the Hitori Solver grid (or press Random) and click Solve to see the shading and the reasoning.