Notes on this puzzle
This hard kakuro fits 72 cells to fill into a 10×10 frame, tied together by 36 clue squares.
12 of the 40 runs can be filled with only one set of digits:
- 3 in 2 → 1 + 2
- 4 in 2 → 1 + 3
- 16 in 2 → 7 + 9
- 17 in 2 → 8 + 9
- 7 in 3 → 1 + 2 + 4
- 23 in 3 → 6 + 8 + 9
The longest run is 6 cells long and 16 runs have only two cells, which is where the arithmetic is tightest. Clue totals go from 3 up to 38, with an average of 18.4.
Where to beginA good first target is the cell at row 2, column 4 of the field: the two runs crossing there settle it. Longer runs hide fewer certainties; build from the short runs inwards.