Kakuro

Kakuro is a crossword made of numbers. Each clue in a dark square gives the sum of the white run to its right (across) or below it (down). Fill the runs with digits 1 to 9, never repeating a digit inside one run.

How to play kakuro

1. Tap a white square and choose a digit.
2. Each across clue (upper right of a dark square) is the sum of the run to its right; each down clue (lower left) is the sum of the run below it.
3. No digit may repeat inside a run. Press Check to find mistakes.

Magic blocks: sums with only one combination

Strategy

Start with the unique combinations above, then look where an across run and a down run cross: the shared square must use a digit allowed by both. Large and small sums narrow the options fastest.

Kakuro quiz: 10 questions

Test yourself with 10 multiple-choice questions. Choose an answer and press Submit to see if you are right and why. Your score appears at the end.

Frequently asked questions

What is kakuro?

A number crossword: fill runs of white squares with 1 to 9 so they add up to the clues, with no repeated digits in a run.

Is kakuro hard?

Small grids are quick; bigger ones need combination logic. Learn the unique sums first.

Do generated puzzles have one solution?

Not always. Any grid that satisfies every clue counts as solved.

Does kakuro help with math?

Yes. It drills addition facts and reasoning about combinations.

Can I use the keyboard?

Yes. Select a square and type a digit; 0 erases.

Sources

• Wikipedia: Kakuro

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