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.
Every board above is a position from a real puzzle where a Hidden Single is the next step. Select the cell, press its digit (on the pad or your keyboard) and press Check. If you’re stuck, Show me gives the answer and Next puzzle loads another. Want to watch one first? Switch to Worked example.
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
- Scan each row, column, and box for a candidate that appears only once.
- Select that cell and press its digit.
- Press Check. A wrong digit is underlined in red and you can try again.
Start Practicing on Full Puzzles
Once you can find Hidden Singles on most boards without pressing Show me, take it into a full game. Easy puzzles are where this technique starts to come up, and the step-by-step solver will name the technique each time you get stuck.