Kakuro: sum 28 in 4 cells
A sum of 28 in 4 cells can be made 2 ways.
| Combination | Digit set |
|---|---|
| 4 + 7 + 8 + 9 | 4789 |
| 5 + 6 + 8 + 9 | 5689 |
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: 8, 9. Whatever the combination, the run must contain them.
- Digits that can never appear: 1, 2, 3. 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 17 in 5 cells (page).