Enter your run length and target sum — all valid digit combinations appear immediately. Use the Filter numbers panel to exclude digits already placed in that row or column, and the Intersection Helper to pinpoint exactly which digit belongs at a crossing cell.
A crossword with digits: each run of white cells adds up to its clue, using 1–9 without repeats.
The full guide, with a worked example and common mistakes: How to play Kakuro.
The number in the upper-right is the total for the run going across; the one in the lower-left is the total for the run going down.
Yes — see the Kakuro combinations chart, which lists every total for runs of 2 to 9 cells and marks the ones with a single combination.
Build it in the Kakuro Solver: click cells to make them black, enter the clues, then solve step by step.
It needs some arithmetic and combination knowledge, but the logic is similar. Easy Kakuro is a good next step after Sudoku.
Nine cells, which must contain every digit 1–9 and so always totals 45.