📐 Kakuro

Kakuro is often called the maths crossword. Each run of white cells has a clue number; fill the cells with digits 1–9 so the run adds up to it, with no digit repeated inside a run.

How to play

1. Clue cells show the target for the run below (↓) or to the right (→).
2. Tap a cell and enter a digit 1–9; digits may not repeat within a run.
3. Every run must hit its exact total — use combinations to deduce the cells.

Strategy tips

• Memorise the unique combos: a 2-cell 3 is {1,2}, a 2-cell 17 is {8,9}, a 3-cell 6 is {1,2,3}.
• Every cell sits in two runs — intersect the across and down candidates to shrink options.
• In the endgame, subtract placed digits from the clue and solve the remainder as a fresh mini-run.

FAQ

Can a digit repeat within a run?

Never — digits 1–9 may each appear once per run.

Is Kakuro harder than Sudoku?

Different skills — Kakuro leans on arithmetic combinations rather than pure elimination. Most players find it friendlier once the combos are memorised.

What do the clue numbers mean?

The number in a dark cell is the required sum for the run below it (↓) or to its right (→).

Difficulty affects grid size and time is your score — finish fast, post to the daily leaderboard, or race a friend.

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