Sudoku is one of the world's favourite number puzzles, and you do not need to be good at maths to enjoy it – it is all about logic. Fill the 9x9 grid so that every row, every column and every 3x3 box contains the numbers 1 to 9 exactly once.
It is calm, quiet and wonderfully satisfying when the last number drops into place. Play free in your browser on your phone or computer, with no sign-up. New to puzzles? Read why short puzzles make a fun daily habit.
How to play Sudoku
- The puzzle starts with some numbers already filled in.
- Select an empty cell and enter a number from 1 to 9.
- Each row must contain every number from 1 to 9 once.
- Each column and each 3x3 box must also contain every number once.
- Fill the whole grid correctly to solve the puzzle.
Tips to score higher
- Scan each 3x3 box for numbers that can only go in one place.
- Look for rows or columns that are nearly full – they are often the easiest to finish.
- If a cell has only one possible number, fill it in straight away.
- Never guess. Every proper Sudoku can be solved with logic.
- Take a short break if you get stuck; fresh eyes often spot the next move.
Frequently asked questions
Do I need to be good at maths to play Sudoku?
No. Sudoku uses numbers as symbols, but there is no adding or calculation – it is a logic puzzle.
Is Sudoku free to play here?
Yes. You can play Sudoku free in your browser with no download or sign-up.
Does each Sudoku have only one answer?
A well-made Sudoku puzzle has exactly one correct solution.
Can I earn coins for solving Sudoku?
In the TNChatZone app you can earn coins by playing games like Sudoku. Coins are for fun only and have no cash value.