Kakuro, free to play

A crossword made of sums. Fill the white squares with 1 to 9 so every run adds up to its clue.

How to play

Read the clues
A black square shows two numbers: the sum of the run to its right, and the sum of the run below it.
Fill in digits
Type a digit from 1 to 9 into each white square. A digit may not repeat inside one run.
Start with short runs
Two-square runs with a very small or very large total have only one answer. A total of 3 must be 1 and 2; a total of 17 must be 8 and 9.

Quick answers about playing Kakuro on Wittlo.

Is Kakuro free?

Yes. It is free to play, with no sign-up and nothing to install.

What is Kakuro?

A number puzzle also called cross sums. It looks like a crossword, but the clues are totals instead of words.

Does every puzzle have one answer?

Yes. A solver checks that each puzzle has exactly one solution.

Do I need to guess?

Not usually. Combine two runs that cross in a square to narrow the digits down. Hint fills in a square if you are stuck.

What do the red squares mean?

A digit repeated in a run, or a full run whose total is wrong.

Sudoku with arithmetic cages: add, subtract, multiply or divide to the target.

Classic number logic in 4x4, 6x6 or 9x9. A new puzzle every day.

Letters stand for digits. Work out which, so the sum is true.

Number clues reveal a hidden picture. No guessing needed.