4-cell killer cage summing to 23
9 combinations.
- Always present
- No digit is forced into this cage.
- Never present
- Every digit can appear in this cage.
Valid digit combinations
- 1589
- 1679
- 2489
- 2579
- 2678
- 3479
- 3569
- 3578
- 4568
How to use this in play
9 digit sets sum to 23 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.