Kakuro

How to use it

• Play — a puzzle at the chosen size and level: 8×8, 11×11, 14×14, the clue row and column included.
• Daily — one puzzle per date, numbered from 21 October 2026, larger and harder through the week: Monday 8×8 Easy, Tuesday 8×8 Medium, Wednesday 11×11 Easy, Thursday 11×11 Medium, Friday 11×11 Hard, Saturday 14×14 Hard, Sunday 11×11 Medium. A daily you are playing at midnight stays on the page until you finish it. Opened on a later day, the page shows that day's puzzle instead, and an earlier one you had started counts as played, not won.

A clue above the diagonal of a block is the sum of the run to its right; one below it, the run underneath. Select a white cell, then a digit; the arrow keys jump from white cell to white cell, Backspace clears, N switches notes and Shift with a digit adds a note. Cells stay at least 32 pixels wide, so on a phone the larger grids scroll sideways inside their frame.

The combination helper shows both runs through the selected cell: every set of different digits that makes each sum, struck through once the grid rules it out, and the digits every open set holds. Auto fills each empty cell with what both its runs allow. Hint first points out a wrong digit, then finds the simplest next step and explains it; the second press applies it.

A game finished after a hint, a revealed cell or with mistakes shown counts as played, not won, and ends your streak. Stats are kept per size and level, and puzzles print 1, 2, 4 or 6 to a page with their solutions after.

How to solve Kakuro

Unique sums. Some clues allow one set of digits only: 3 in two cells is 1 + 2, and 23 in three is 6 + 8 + 9. Start there. Intersections. A cell belongs to an across run and a down run, so it can only hold a digit both runs can use: where a 3 in two cells (1 + 2) crosses a 4 in two (1 + 3), the shared cell can only be 1.

Run combinations. Where a run has several sets, keep only those its cells' candidates can still hold. Block sums. The across runs of a block of rows add to their clues; take away the down runs wholly inside the block, and the cells left over make up the rest.

The puzzles come from a fixed bank of 300 per size and level, each with 180° symmetric blocks and runs of 2 to 9 cells. The digits are filled at random and then changed one cell at a time until the puzzle can be solved by logic at its level and needs that level; a puzzle solved by logic alone has only one solution.

Worked hints

Quick reference

Frequently asked questions

See also

• Killer Sudoku — for sum cages on a full Sudoku grid.
• Calcudoku — for cages with +, −, × and ÷.