About Kakuro
Fill the white cells with digits from 1 to 9. Each horizontal or vertical run must add to its clue, without repeating a digit. Crossings narrow the possible combinations, turning simple sums into a logic puzzle.
How to play
- Goal
- Fill every white cell with 1 to 9 so each run adds up to its clue, with no digit twice in a run.
- How it ends
- A page is solved when every cell is written, every run adds up and nothing repeats. There is no way to lose.
- Record
- The fastest first solve of each page, with its holder's name.
- Pick a ledger — Tally 6×6, Daybook 8×8, Ledger 9×11, Assay 9×14 or Reckoning 9×17 — and open a page. The clock starts as the page is dealt.
- Tap a white cell, then a digit. The same digit again rubs it out; Marks writes small, several to a cell, and nothing but you ever touches those.
- A run that is full and does not add up, or that repeats a digit, shows its own figure in red. Nothing else is ever told to you.
- Start where the arithmetic is forced: a 3-in-two can only be 1 and 2, a 16-in-two only 7 and 9, and a 45-in-nine is every digit there is. The crossings do the rest.
- The clock does not stop, and leaving a page keeps everything — the digits, the marks and the time. A page you come back to is yours to finish, but only a page done in one sitting takes the record.
Controls
| Input | Action |
|---|---|
| Click · Tap | Choose a cell, then a digit |
| 1 – 9 | Write the digit |
| 0 · Backspace | Rub it out |
| ↑ ↓ ← → | Move between cells |
| M | Pencil marks on and off |
| U · Ctrl+Z | Undo |
| R · Restart | Rub the page out; the clock keeps running |
Good to know
320 pages, every one proven to have a single answer reachable without guessing. The best time on each page is shared with every player; your own times, and the page you are in the middle of, stay in this browser.
Watch how to play
Did you know?
Kakuro first appeared in Nikoli’s magazine in volume 11. Its small sums hide a useful trick: a sum can often be narrowed to just a few possible sets of digits.
Source: Nikoli: Kakuro
