Sudoku

About Sudoku

Sudoku is a number-placement logic puzzle. The classic grid is 9×9, divided into nine 3×3 boxes. The challenge is to place digits so every row, column, and box contains the numbers 1 to 9.

How to play Sudoku

Fill empty squares with numbers from 1 to 9. Each number can appear only once in each row, column, and 3×3 box. Use the given numbers as clues and solve through deduction.

Tips for playing Sudoku

Start by scanning rows, columns, and boxes for missing numbers. Look for places where only one number can fit. Avoid guessing early; careful elimination is usually safer.

Sudoku history and background

The modern Sudoku puzzle grew from earlier number-placement ideas. It appeared as Number Place in American puzzle magazines in 1979 and became widely known under the name Sudoku after Japanese puzzle publishers popularised it.

Sudoku FAQ

Does Sudoku require maths?

No. Sudoku uses numbers, but it is mainly a logic puzzle rather than an arithmetic puzzle.

What makes a Sudoku move legal?

A number is legal if it does not already appear in the same row, column, or 3×3 box.