Beginner Sudoku Strategy
Naked Singles
When a cell has exactly one candidate left after row, column, and box checks, that digit is forced on NYT Sudoku boards.
Core concept
What it means
A naked single is the clearest Sudoku move. The answer is visible in the cell's own candidate list because every other digit has been eliminated.
The important part is that this is not a guess. A good Sudoku move should explain why at least one digit is forced or impossible. Naked Singles gives you that explanation by connecting the three checks that define the puzzle: row, column, and 3x3 box.
Use this technique slowly at first. Name the container or region you are studying, list the legal candidates, and only then place a final digit or remove a note. That habit keeps the board readable when harder puzzles make several deductions interact at once.
Pattern triggers
When to use it
Look for Naked Singles when direct scanning slows down and you need a concrete reason to place a digit or remove a candidate.
- Cells in nearly finished rows.
- Cells affected by several recent placements.
- Medium boards after a full note cleanup pass.
Solving routine
Step-by-step method
Use this method slowly enough that every removal and placement can be checked against the grid.
- 1
Create or update candidate notes for a small area.
- 2
Find cells with only one candidate.
- 3
Place the remaining digit as a final value.
- 4
Update all peer cells in the same row, column, and box.
Worked example
How it appears on a real board
If a cell's notes show only 4, place 4. The move does not depend on intuition; all other digits are already blocked.
After the deduction, update related cells immediately. A single placement changes its row, column, and 3x3 box, and stale notes are the fastest way to create mistakes.
Accuracy checks
Common mistakes
Most Sudoku errors come from moving before all three units agree. Before placing a final digit, check the row, the column, and the 3x3 box.
- Calling a cell a single before checking its 3x3 box.
- Forgetting to update notes after placing the digit.
- Placing a digit because it feels likely rather than forced.
Practice checklist
Use it on your next board
Ignore the timer for one puzzle and place only digits that are naked singles until no more remain.
- Name the row, column, or box you are studying.
- Remove candidates only when a visible rule explains the removal.
- After a placement, update every affected note before scanning elsewhere.
- Use hints only as a nudge, then continue with auditable logic.