Naked Single
A cell has only one candidate left after eliminating peers.
Learn the Naked Single Sudoku technique: a cell whose row, column, and box leave just one possible digit. Play and learn free.
How to use it
- Pick an empty cell. Choose any empty cell and look at its row, column, and box.
- Eliminate seen digits. Cross off every digit that already appears in that cell’s row, column, or box.
- One candidate remains. If exactly one digit survives, it is a Naked Single — place it with confidence.