GridWits
Easy tier Technique 1 of 20 Used by Smart Hint

Naked Single

Only one digit remains possible for this cell — place it.

How it works

  1. 1This cell sits where an across run and a down run cross, so it has to satisfy both.
  2. 2The across run is 17 over two cells, and only 8 + 9 reaches that — so this cell is an 8 or a 9.
  3. 3The down run is 16 over two cells, and only 7 + 9 reaches that — so it is a 7 or a 9.
  4. 4One digit is on both lists and nothing else is. Place the 9.
16 17 9 8 9 7 9
  • Cells that establish the pattern
  • Where the conclusion lands
Next in the ladder Single Combination →

This run's remaining sum has exactly one digit combination left — every empty cell must draw from it. The classic "17 in two cells is 8+9" move.