Play Sudoku Online — Free
Classic Sudoku puzzles. Fill every row, column, and 3×3 box with digits 1–9. Free online, no download needed.
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About Sudoku
Sudoku is the world’s most-played logic puzzle, appearing in newspapers, apps, and dedicated handhelds worldwide. The rules are elegantly simple: fill a 9×9 grid so that every row, every column, and every 3×3 box contains the digits 1 through 9 exactly once. Despite this simplicity, the depth of logical deduction required to solve harder puzzles is extraordinary.
The puzzle originated in the United States in the 1970s as “Number Place,” was popularized in Japan in the 1980s as 数独 (Sudoku, meaning “single number”), and reached global prominence in 2004 when a retired New Zealand judge introduced it to the British press. Sudoku became a cultural phenomenon overnight.
What makes Sudoku enduringly popular is the pure logic at its core. No arithmetic is needed — digits are just symbols. The same techniques that work on a beginner’s puzzle — scanning, naked singles, hidden singles — scale up in sophistication to cover the most diabolically difficult expert grids.
BePuzzled offers three grid sizes (4×4, 6×6, and 9×9) across four difficulties. The 4×4 variant is perfect for children or complete beginners, while expert 9×9 puzzles will test even seasoned solvers.
Frequently asked questions
What are the rules of Sudoku?
Fill a 9×9 grid so that every row, every column, and every 3×3 box contains each digit from 1 to 9 exactly once.
What is the easiest way to start a Sudoku?
Look for rows, columns, or boxes that already have the most numbers filled in — these have the fewest possibilities. The "naked single" technique (a cell with only one possible digit) is the most reliable starting point.