4-cell killer cage summing to 16
8 combinations.
- Always present
- No digit is forced into this cage.
- Never present
- Every digit can appear in this cage.
Valid digit combinations
- 1249
- 1258
- 1267
- 1348
- 1357
- 1456
- 2347
- 2356
How to use this in play
8 digit sets sum to 16 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.