Practice Hidden Single Sudoku Technique

Ready to put the hidden single technique into action? This page is designed for you to practice and master hidden singles with real Sudoku puzzles.

Quick Reminder: What is a Hidden Single?

A hidden single occurs when a candidate number appears only once in a row, column, or box—even if the cell has other candidates. When you spot a hidden single, you can confidently place that number in the cell.

Want a full step-by-step guide? Read the Hidden Single Technique article

How to Practice

  1. Scan each row, column, and box for a candidate that appears only once.
  2. Place that number in the cell where it is the only candidate.
  3. Use this placement to unlock more cells and progress in the puzzle.

Start Practicing

Try the puzzles below and focus on finding and applying hidden singles. The more you practice, the easier it will be to spot this essential technique in any Sudoku!

Now that you know how to apply this strategy, see if you can find it on one of our Sudoku puzzles!