Kakuro

A crossword built from sums.

Runs of white squares, each with a clue that gives its total. Fill the runs with digits so every across and down total is met.

How to play

Each clue is the total of the run beside or below it.
Digits are 1 to 9, and never repeat within one run.
Stuck? The run helper lists every combination that still fits. It's free.

Tips and tricks

Know the fixed runs. Two squares totalling 3 are 1+2; 4 is 1+3; 16 is 7+9; 17 is 8+9.
And the fixed threes. Three squares totalling 6 are 1+2+3; 7 is 1+2+4; 23 is 6+8+9; 24 is 7+8+9.
Work the crossings. A square sits in an across run and a down run. Only digits allowed by both can go there.
Extremes first. Very small and very large totals have the fewest combinations, so start with them.
Let the run helper do the arithmetic. It lists every combination still possible for a run, so you can spend your thinking on the crossings.

Where to find it

It takes its turn on the daily page alongside five other rotating games, and the Library always has Easy, Medium and Hard tracks of it. Stuck? A hint costs ink drops, and Inkbloom Plus makes hints unlimited.