⬛ Hitori

How to play Hitori

1. Press New Game. The grid is full of numbers, some repeated.
2. Tap a cell to black it out; tap again to mark it as a keeper, once more to clear the mark.
3. Black out cells so no number repeats among the remaining whites in any row or column.
4. Two black cells may never touch side by side, and all whites must stay connected.

Controls

Tips & strategy

• A number sandwiched between two equal numbers must be the keeper — you can't black both sides.
• Blacking a cell forces its four neighbours to stay white, which often cascades.
• Keep an eye on connectivity: don't wall off a white cell from the rest.
• Pairs of equal numbers in a line tell you exactly one of them must go.

Frequently asked questions

What are the rules of Hitori?

Black out cells so no number repeats among whites in a line, no two blacks are orthogonally adjacent, and the white cells form one connected group.

Is there always a solution?

Yes — each puzzle is built from a valid blackout pattern, so a consistent solution exists.

How is my score tracked?

Your record is the fastest solve time, saved per grid size.