Just Kakuro
A crossword with sums instead of words. Every run of white cells adds up to its clue, and no digit repeats inside a run.
A new board
The rules
- Each white cell takes a digit from 1 to 9.
- A row or column of white cells is a run. Its clue is the run's total: top right for across, bottom left for down.
- A digit never repeats inside a run.
Tap a cell, then a digit. Notes pencils in the digits a cell could still take. With a keyboard: arrow keys move, digits enter, Shift with a digit makes a note, Backspace clears.
The techniques
The solver that builds each board knows 8 named techniques, listed here in the order it reaches for them. A board is kept only if they are enough to finish it.
- No Repeats
- Magic Blocks
- Cross Reference
- High & Low
- Last Candidate
- Only Place
- Combination Logic
- Sum Arithmetic
Questions
Do I ever have to guess in Kakuro?
No. Every board is proved to have exactly one solution before it reaches you, and each step can be reasoned out.
Is Kakuro free to play here?
Yes. New small and medium boards at every difficulty, with pencil notes, are free, with no account and no ads. Large boards, the lessons, the drills and the hints are in Just Kakuro, the app.
Is there a daily Kakuro?
No. Every board is new, and its address keeps the seed, so the same board can be opened again.
Along the street
In the app
Eight named techniques, from No Repeats and Magic Blocks to Sum Arithmetic, each with its own lesson and practice drills. Hints that teach the argument instead of giving the answer. Large boards and your statistics. One purchase, no ads.