Hitori · how to play
Shade the duplicates.
The rules
Shade some cells (black them out) so that:
- No repeats. No number appears more than once un-shaded in any row or column.
- No touching. Two shaded cells can never be next to each other (up, down, left or right — diagonals are fine).
- All connected. Every un-shaded cell must connect to the others in one continuous group.
Every puzzle has exactly one solution — pure deduction, no guessing.
How to play here
Tap a cell to cycle it: shade ■ → mark safe ◯ → clear. Use the circle to mark cells you’re sure stay white. Cells that break a rule light up red, and Check flags wrong shading.
A starting tip
A pair of equal numbers with a third equal one between or beside them tells you a lot: you can never shade two neighbors, so in a run of three identical numbers the middle one is always safe (white) and the two ends get shaded.
Interactive
Shade the duplicates together
Step 1/3:Row 1 has two 3's (columns 1 and 4). One must be shaded. Column 4 also has issues — shade the 3 at row 1, column 4 (top-right corner).
Tap the top-right cell to shade it.
Tap a cell to cycle: shade it ■ → mark it safe ◯ → clear. Right-click cycles backwards · Cmd+Z undoes.
Next: Hitori strategiesSandwiched triple · Pair split by one · No adjacent shades — solve faster, never guess.