How to play

How to Play Sudoku

Sudoku is a logic-based number placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-boxes contains all of the digits from 1 to 9.

Rows

Each row must contain the numbers 1-9 with no repetition.

Columns

Each column must contain the numbers 1-9 with no repetition.

3x3 boxes

Each 3×3 box must contain the numbers 1-9 with no repetition.

Example board

See the rule zones

5
3
7
6
1
9
5
9
8
6
8
6
3
4
8
3
1
7
2
6
6
2
8
4
1
9
5
8
7
9
Beginner tips

Start with a good rhythm

Start with rows, columns, or boxes that already have many numbers filled in.

Use pencil marks (notes) to track possible values for each cell.

Look for "naked singles" where only one number can fit.

Look for "hidden singles" where one number only fits one cell in a row, column, or box.

Do not guess. Every Sudoku puzzle can be solved with logic alone.