4-cell killer cage summing to 20
12 combinations.
- Always present
- No digit is forced into this cage.
- Never present
- Every digit can appear in this cage.
Valid digit combinations
- 1289
- 1379
- 1469
- 1478
- 1568
- 2369
- 2378
- 2459
- 2468
- 2567
- 3458
- 3467
How to use this in play
12 digit sets sum to 20 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.