Hidden Singles

How It Works

Hidden Singles occur when a particular number can only be placed in one cell within a row, column, or 3x3 box. Even though the cell may have multiple candidates, it is the only cell in its group that can hold that specific number.

Step by Step

1. Choose a number (1-9) and a group (row, column, or box).
2. Check all empty cells in that group for whether they can hold that number.
3. If only one cell in the group can hold it, place it there.