Kakuro: sum 12 in 4 cells
A sum of 12 in 4 cells can be made 2 ways.
| Combination | Digit set |
|---|---|
| 1 + 2 + 3 + 6 | 1236 |
| 1 + 2 + 4 + 5 | 1245 |
What this tells you
- There are 2 possibilities, so this clue alone does not decide the digits. Use crossing runs and any known cells to eliminate combinations.
- Digits in every combination: 1, 2. Whatever the combination, the run must contain them.
- Digits that can never appear: 7, 8, 9. You can remove them from every cell of the run.
Related sums
The digits left out of each combination form a combination for the mirror run: sum 33 in 5 cells (page).