Every Kakuro combination, instantly
Pick the clue and the number of cells. You get every set of different digits from 1 to 9 that fits, the digits that must appear, and which ones can never be there.
Use this when a crossing clue has already fixed or ruled out a digit.
Show every sum for this many cells
In Kakuro, each run of cells must add up to its clue using different digits from 1 to 9. Some clues have only one possible set: for example 3 in two cells is always 1 and 2, 4 in two cells is 1 and 3, and 16 in two cells is 7 and 9. Knowing these unique sets is the fastest way into a hard puzzle.
Like adding up paths? Try a calmer sum puzzle
This calculator is from the makers of Sumthread, a calm number-path puzzle for iPhone. According to its App Store listing:
- Trace one continuous path through every tile, hitting the target sums in order
- Drag or tap step by step, and backtrack any time
- Daily Thread: a fresh 4×4 board each day
- Earn the Clean Weave seal by finishing with no hints and no undos
Kakuro combinations worth memorising
With two cells: 3 = 1+2, 4 = 1+3, 16 = 7+9, 17 = 8+9. With three cells: 6 = 1+2+3, 7 = 1+2+4, 23 = 6+8+9, 24 = 7+8+9. With four cells: 10 = 1+2+3+4, 11 = 1+2+3+5, 29 = 5+7+8+9, 30 = 6+7+8+9. Open the table above to see the rest, marked with a star.
How to use the digit buttons
When a crossing run has already told you something, tap the digit once to require it, or twice to rule it out. The list narrows to the combinations still possible, and the verdict tells you if only one set is left.
Questions
Can a digit repeat in a Kakuro run?
No. Each run uses different digits, which is what makes the combinations limited and the puzzle solvable.
What is the largest possible clue?
45, using all nine digits (1+2+…+9) in nine cells. The calculator shows the smallest and largest possible sum for each number of cells.
Does this solve the whole puzzle for me?
No. It lists what each clue allows. You still decide where each digit goes, which is the fun part.