2-cell Kakuro run summing to 9
4 combinations.
- Always present
- No digit is forced into this run.
- Never present
- 9
Valid digit combinations
- 18
- 27
- 36
- 45
How to use this in play
4 digit sets sum to 9 across 2 cells. The run on its own is permissive; its constraints become useful when intersected with the perpendicular runs at each of its cells.