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Melio/Sudoku

Nakedsingles practice

A naked single is a cell where only one digit is legal given the rest of the board. Spotting them fast is the single most useful sudoku skill. This trainer presents an endless stream of partial boards, each with one target cell. Click the cell, get the next puzzle.

Streak
0
Best
0
Accuracy
—

Generating a fresh puzzle…

How it works

Each round shows an Easy-difficulty puzzle. Exactly one empty cell has only one legal digit given the rest of the board — that’s your target. Click any cell to answer. Correct → next puzzle, streak +1. Wrong → the correct cell flashes, streak resets.

See Sudoku tips for beginners if you want the broader context on what naked singles are and how to scan for them, or the glossary for the one-paragraph definition.

More sudoku

  • Today’s daily sudoku →
  • Once you’ve mastered naked singles: pointing pairs →
  • Sudoku rules →