Look for unique sums
Cages like sum 3 in 2 cells ([1,2]), sum 17 in 2 cells ([8,9]), or sum 6 in 3 cells ([1,2,3]) have exactly one possible combination.
Free tool / Cage combinations
Mord-Sudoku-Löser
Input any cage sum and cell count to instantly see all valid non-repeating digit sets, mandatory numbers, and impossible candidates.
Cage parameters
Select sum and cage size
Must include digit:
Must exclude digit:
Valid Combinations
0 combinationsStrategy insights
How to use cage sums for instant eliminations
Filter by row/column givens
If a cage crosses a row where digit 7 is already placed, exclude 7 to immediately prune combinations.
Apply constraint deduction
When you enjoy elimination logic, try Detective Sudoku to solve narrative constraint grids where clues eliminate suspects.