3-cell Kakuro run summing to 21
3 combinations.
- Always present
- No digit is forced into this run.
- Never present
- 123
Valid digit combinations
- 489
- 579
- 678
How to use this in play
3 digit sets sum to 21 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.