Kakuro
Cross-sums number puzzle: fill 1–9 into white cells so every horizontal and vertical run adds up to its clue, with no repeated digit inside a run. Endless procedurally generated levels with a guaranteed UNIQUE solution, plus pencil notes, combination hints, undo and a custom-board mode from 5 to 12 cells.
Kakuro is a cross-sums number puzzle that feels like a mathematical cousin of the crossword. Each run of white cells must add up to a target clue, with no digit repeating inside it, and cracking one run often unlocks the next. It's a rewarding logic game for anyone who likes numbers and deduction.
How to play
Fill the white cells with digits 1–9 so that every horizontal and vertical run sums to its clue. No digit may repeat within a single run, which constrains your options in useful ways. Every procedurally generated level has a guaranteed unique solution, and tools like pencil notes, combination hints, undo, and a custom-board mode from 5 to 12 cells help you work it out.
Tips
- Start with short runs that have extreme clues, like a two-cell run summing to 3 (only 1+2).
- Use pencil notes to jot candidate digits before committing to any cell.
- Where a row and column run cross, find the digit both allow to lock a cell.
- Lean on the combination hint to see which digit sets can make a given clue.
If numbers and logic are your thing, try Sudoku or bridge the islands in Hashi — Bridges.
Objective
Fill digits 1–9 into every white cell. Each run of consecutive cells must add up to its clue written in a black cell (top-right corner = sum of the row run to the right, bottom-left corner = sum of the column run below). A digit may NOT repeat within one run.
Controls
- Tap a white cell to select it, then tap a digit 1–9 on the keypad
- ✎ Notes: toggle to pencil small candidate digits into a cell
- Σ Combos: view every way to split the sum of the selected run
- ↶ Undo / ↷ Redo, ⌫ Erase cell, ↺ Restart level
- Keyboard: digits 1–9, arrow keys to move, 0/Backspace to erase, N for notes
- ⚙ opens the custom board panel (width/height 5–12)
Tips
- 2-cell runs summing to 3 (=1+2), 4 (=1+3), 16 (=7+9) or 17 (=8+9) are "magic" — only one combination exists
- 3-cell runs of 6 (=1+2+3), 7, 23 and 24 also have a single combination
- Where a row run crosses a column run, the digit must belong to BOTH combination sets — intersect them to eliminate
- Long runs with tiny (or huge) sums force small (or large) digits — start there
- Pencil notes for candidates and undo freely when a branch fails