GridWits

Naked Single

Easy Used by Smart Hint

Only one candidate remains for a cell — place it.

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

How it works

  1. Row 5 already has eight of its nine digits filled in — only 5 is missing.
  2. E5 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 →