Planet Sudoku

How do you Sudoku? Introduction to How To's

Solving Techniques

Millions of Free Sudoku Puzzles 4x4, 6x6, 8x8, 9x9, 12x12, to 25x25 at Planet Sudoku!

Planet Sudoku's helpers section will improve your puzzle solving skills.

Show Hints / Candidates will help you see the available pencil values within the cell, row, column, and boxes.

Sudoku How To Technique: Naked Single

The easiest Sudoku cell solving technique. Using hint reduction methods we are able to see which cell has only one valid HINT left, which can be safely penciled into the cell. In the diagram you can see that CELL R1C1 has one HINT left. This is because if you look at the ROW R1 it doesn’t have a pencil or pen of {8}. Also, COLUMN C1 does not have a pencil or pen of {8}. BOX 1 (made up of R1C1, R1C2, R1C3, R2C1, R2C3, R2C4, R3C1, R3C2, and R3C3) also does not have a pen or pencil of {8}. Since this is the only valid value for this cell we know we can enter {8} in as the pencil value for R1C1. After the pencil is applied, we can then remove the HINT of {8} from the CELLS highlighted in red (R1C4, R1C5, R3C2, and R1C4).

This solving method has been categorized as Very Easy Sudoku. Try this and other Very Easy Sudoku solving methods.
Try this Naked Single Sudoku puzzle.

Puzzle Number: 493382
Method: NAKED SINGLE {8} - In Block Type: N/A
Found Cell and Hints: s1r1c1 8;
Removing Hints: s1r1c4 8; s1r1c5 8; s1r4c1 8; s1r3c2 8;

Start playing Sudoku online today! We have many different boards and difficulty levels to choose from.