Fill the 9×9 grid so every row, column and box has digits 1–9.
Sudoku is a classic number placement puzzle played on a 9×9 grid divided into nine 3×3 boxes. The goal is to fill every row, every column, and every 3×3 box with the digits 1 through 9, with each digit appearing exactly once. Some numbers are given as starting clues — use logic to figure out where the remaining numbers go.
Start by scanning rows, columns, and boxes that already have the most numbers filled in — these are the easiest to complete. Look for cells where only one number can possibly fit. As you get more comfortable, learn techniques like "naked pairs" and "pointing pairs" to tackle harder puzzles.
Our free online Sudoku offers easy, medium, and hard difficulty levels with a built-in timer. No download or account needed — play directly in your browser on any device. A fresh daily Sudoku puzzle is available every day.