Hidden Single - Your Gateway to Intermediate Sudoku

What is a Hidden Single?

A Hidden Single occurs when a specific number can only be placed in one cell within a unit (row, column, or box). The cell may have other candidates too - hence it's "hidden."

Difference from Naked Single

- Naked Single: A cell has only one candidate - Hidden Single: A number has only one possible position in a unit

How to Find Them

1. Focus on a row, column, or box 2. Pick a number not yet placed in that unit 3. Check which empty cells could contain that number 4. If only one cell works, the number goes there

Practice Tip

Think "where can this number go?" rather than "what goes in this cell?" This shift in perspective is key to finding Hidden Singles quickly.