Sudoku

About the game

Sudoku hands you 81 squares: nine rows, nine columns, and nine blocks of 3x3 tucked inside them. A few squares come with a digit already written in. The rest are blank and yours to finish.

Pick a difficulty before you start, then work one square at a time. Every row, every column and every 3x3 block has to end up holding each digit once, so a number you set down rules out the same number in its line and its block. Wrong entries happen, and the game warns you about them.

How to play

• Click the square you want, then click a digit from 1 to 9 to place it.
• Press Notes to jot candidate digits in a square without placing one.
• Each digit appears once per row, once per column and once per 3x3 block.
• Choose a difficulty first, and keep an eye out for wrong entries.

• Free
• No download
• Works on phones