Kakuro is a crossword made of numbers. Each grid here is built by our generator and checked by the kakuro solver: exactly one answer, and a level set by how far simple logic gets.
How to play kakuro
The black squares hold clues. A number below the diagonal is the sum of the white run going down from it; a number above the diagonal is the sum of the run going across. Fill every white square with a digit from 1 to 9 so that:
- each run adds up to its clue;
- no digit repeats within a run (it may repeat elsewhere in the same row or column, in another run).
Tap a white square and a digit. Pencil keeps candidate digits small. A run that is full but adds up wrong, or a repeated digit, turns red.
Levels
Easy grids are 6 by 6 and medium 7 by 7; both can be finished with the hint logic alone: the digit combinations a run allows, where two runs cross, and the digits a run cannot do without. Hard grids are 8 by 8 and those simple steps run out part way, so you will need to combine several runs and test possibilities in your head.
Kakuro tips
- Learn the fixed sums. Two squares adding to 3 are 1+2, to 4 are 1+3, to 16 are 7+9, to 17 are 8+9. Three squares adding to 6 are 1+2+3 and to 24 are 7+8+9. Our kakuro combinations chart lists every case.
- Cross the runs. A square in a 3-in-two run (1 or 2) and a 4-in-two run (1 or 3) can only be 1.
- Look for required digits. 23 in three squares is always 6+8+9, so 9 is in that run even if you do not know where yet.
- Large and small extremes: a run of 45 in nine squares is 1 to 9; sums close to the minimum or maximum for their length have few combinations.
Hints and stats
Hint shows the next logical step with the combinations it relies on, or on hard grids reveals a square from the unique answer when no simple step is left. Check and Show mistakes compare digits with the solution, and best times and the daily streak stay in your browser. If you like sums, try killer sudoku online and calcudoku next.
Solver tested . Found a problem? Tell us.
Questions
Can a digit repeat in kakuro?
Not inside one run. The same digit can appear twice in a row of the grid if a black square separates the two runs.
Why are there no zeros?
Kakuro uses only 1 to 9, so a run of two squares adds up to between 3 and 17.
What makes the hard level hard?
On 8 by 8 hard grids the simple steps the hint uses run out before the end. You still never need to guess blindly, but you have to weigh combinations across several runs.
Is the daily kakuro the same for everyone?
Yes. Our generator builds it from the date, one per level, and it changes at midnight on your device.