4-cell killer cage summing to 15
6 combinations.
- Always present
- No digit is forced into this cage.
- Never present
- Every digit can appear in this cage.
Valid digit combinations
- 1239
- 1248
- 1257
- 1347
- 1356
- 2346
How to use this in play
6 digit sets sum to 15 across 4 cells. Without other constraints this cage is loose; the value comes from pairing it with the cage's row, column, or box context — every digit ruled out elsewhere narrows which combinations remain.