GridWits
Easy tier Technique 1 of 31 Used by Smart Hint

Naked Single

Only one candidate remains for a cell — place it.

How it works

  1. 1After the cage and house eliminations, a cell is left with a single pencil mark.
  2. 2A cell with one candidate has no other option, so place that digit.
Next in the ladder Hidden Single →

A digit has only one possible cell left in a row, column, or box — even if that cell has other candidates.