3-cell Kakuro run summing to 20
4 combinations.
- Always present
- No digit is forced into this run.
- Never present
- 12
Valid digit combinations
- 389
- 479
- 569
- 578
How to use this in play
4 digit sets sum to 20 across 3 cells. The run on its own is permissive; its constraints become useful when intersected with the perpendicular runs at each of its cells.