GridWits

Hidden Pair

Hard Used by Smart Hint

Two heights only fit in the same two cells of a row or column — strip those cells down to just those two.

1 2 3 1 2 3 1 2 3 1 2 4 5 3 4 5

How it works

  1. Heights 4 and 5 have to appear somewhere in this row — every height does.
  2. The first three cells have already lost both, so the 4 and the 5 are squeezed into the last two cells.
  3. Two heights with only two cells to live in: those cells hold the 4 and the 5 between them, in some order.
  4. Strike everything else from both — even though neither is pinned to a single height yet. That's what makes it HIDDEN: the pair was buried under other candidates rather than sitting there in plain sight.