About Sudoku
Sudoku is the world’s most popular number-placement puzzle. Fill a 9×9 grid so that every row, every column and each of the nine 3×3 boxes contains the digits 1 through 9 exactly once. Pure logic — no maths or guessing required.
How to play
- Each row must contain the digits 1–9 with no repeats.
- Each column must contain the digits 1–9 with no repeats.
- Each 3×3 box must contain the digits 1–9 with no repeats.
- Use the given numbers to deduce the rest.
Tips & strategy
- Scan for rows, columns or boxes that are almost complete.
- Use pencil-mark candidates to narrow cells down.
- Look for "naked singles" and "hidden singles" before advanced techniques.
Frequently asked questions
What are the rules of Sudoku?
Fill the 9×9 grid so each row, column and 3×3 box contains every digit from 1 to 9 exactly once.
Is Sudoku a maths game?
No — it is pure logic. The digits are just symbols; no arithmetic is involved.
How do I get better at Sudoku?
Practise scanning, learn candidate pencil-marks, then techniques like naked/hidden pairs and pointing pairs.