Techniques · killer sudoku

Cage Combination Limits

Only some sets of different digits add up to a cage total (two cells making 3 can only be 1 + 2). Digits that appear in no such set are ruled out of the cage.

In the walkthroughs, every Cage Combination Limits step shades the cells of the pattern and names the cell and digit it proves, so you can see the move on the grid rather than read about it. Press “Skip to next hard step” to jump straight to it.

None of the walkthroughs published so far needs this one; it is here for completeness.

Where it sits

See the whole ladder on hard killer sudoku techniques, or look a puzzle up by number under solutions.