GridWits
Easy tier Technique 1 of 46 Used by Smart Hint

Naked Single

Only one candidate remains for a cell — place it.

How it works

  1. 1Row 5 already has eight of its nine digits filled in — only 5 is missing.
  2. 2E5 is the row's one empty cell, and 5 is also the only candidate left once its column and box are checked. That makes it a Naked Single — place it.

Play a Sudoku that needs this technique →

A 1 B 2 C 3 D 4 E 5 F 6 G 7 H 8 I 9 1 2 3 4 5 6 7 8 9
  • Where the conclusion lands
Next in the ladder Hidden Single →

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