Classic 9×9 Sudoku
Digits 1–9, one of each per row, column and box.
How to play Classic 9×9 Sudoku
- Fill every empty cell with a digit from 1 to 9.
- Each row, each column and each 3×3 box must contain all nine digits exactly once.
Where to start
A row with 1–8 already placed leaves only 9 for its last empty cell.
Difficulty
Puzzles are generated on your device, so there is an endless supply of them. Classic 9×9 Sudoku comes in 3 grades — or work up the endless track, where every level is generated a little harder than the last.