Discover the “Hidden Single” technique in Sudoku – a basic yet incredibly effective strategy that helps you solve those tricky cells. Learn how to spot and use it in your own puzzles!
What is a Hidden Single in Sudoku?
In the world of Sudoku, a Hidden Single is one of the most fundamental yet essential solving techniques. It’s often the first step both beginners and advanced players should use when approaching a puzzle.
Simple definition:
A hidden single is a number that can only appear in one possible cell within a row, column, or 3×3 box – but its position isn’t immediately obvious. It’s “hidden” among the candidates and must be uncovered through careful analysis.
Sudoku Techniques: Hidden Single vs. Naked Single
Many players confuse the two. Here’s a quick comparison:
| Criteria | Hidden Single | Naked Single |
| Visibility | No – requires checking all options in a group | Yes – the cell has only one valid candidate |
| Difficulty Level | Basic to intermediate | Very basic |
| Area of Analysis | Row, column, or box | Individual cell |
How to identify Hidden Singles in Sudoku Puzzles
To find a Hidden Single, follow these steps:
Check each number from 1 to 9 within a 3×3 box, row, or column.
Mark which cells could potentially contain that number.
If a number fits in only one cell in that area, that’s a Hidden Single!
Example:
Imagine a 3×3 box where the number 4 could go in three cells. But after cross-checking with the corresponding rows and columns, only one of those cells remains valid. That’s your Hidden Single!
Benefits of using the Hidden single Sudoku technique
Easy to apply – no complex logic needed
Highly effective – can unlock key moves in the puzzle
Works at any skill level – essential for both beginners and experienced players
Practice the Hidden single strategy in our online Sudoku game
Our website offers a free, user-friendly Sudoku interface where you can practice the Hidden Single technique (and many more!). Start with an easy level and challenge yourself to find every possible Hidden Single.
The Hidden Single technique may be simple, but it’s a solid foundation for solving Sudoku puzzles more quickly and accurately. Practice regularly to sharpen your skills and explore even more exciting Sudoku strategies!
