Kakuro
The number crossword! Fill each white cell with digits 1–9 so every run sums to its clue — no repeats in a run!
Select a white cell, then enter a digit
About Kakuro
Kakuro is often called a "number crossword" — it combines the logic of crossword puzzles with arithmetic. Black cells divide the grid into white "runs." Each run has a clue number in the corner of an adjacent black cell. You must fill the white cells with digits 1–9 so each run sums exactly to its clue, with no digit repeated within a single run.
Controls
- Click a white cell — Select it for input
- Number keys 1–9 — Enter a digit into the selected cell
- Delete / Backspace — Clear the selected cell
- Arrow keys — Move between cells
- Check button — Highlight correct/incorrect cells
How to Play
- Clue numbers appear in the bottom-right (across) or top-left (down) of black clue cells.
- Fill white cells with 1–9 so each horizontal run sums to its across clue.
- Each vertical run must sum to its down clue.
- No digit may repeat within a single run.
- Use logic and process of elimination — there's always one solution!
Frequently Asked Questions
A run is a consecutive sequence of white cells between two black cells (or a border and a black cell). Each run has exactly one clue — either an across clue (horizontal) or a down clue (vertical).
No — within any single run, each digit 1–9 may appear at most once. A cell belongs to both a horizontal run and a vertical run, so it must satisfy both constraints simultaneously.
Look at the black cells with numbers. The number in the bottom-right triangle is an "across" clue — the sum of the white cells to its right. The number in the top-left triangle is a "down" clue — the sum of white cells below it.
Yes — all 10 puzzles in this game have been hand-crafted to have exactly one valid solution. If you're stuck, try the Check button to see which cells are correct so far.