Sudoku
Classic number puzzle.
Classic number puzzle.
Press start to play — no sign-up, nothing to install.
How to use Sudoku
- Start a new game and choose your difficulty
- Fill the blank cells with digits 1 to 9
- Check your work or reveal the full solution anytime
About Sudoku
Play a full game of Sudoku right in your browser, no download and no sign-up. Each new game generates a fresh, fully solved 9x9 grid and then carves out cells to match your chosen difficulty, so every puzzle has exactly one correct solution. Fill the blanks with the digits 1 to 9 so each row, column, and 3x3 box contains all nine numbers with none repeated.
Pick Easy, Medium, or Hard and you get a different puzzle every time you press New Game. Easy leaves more starting clues for a relaxed solve; Hard strips the grid down so you have to deduce most of it yourself, closer to the tougher newspaper puzzles many people search for. If you get stuck, Check highlights the cells that break the rules or don't match the solution, and Solve reveals the complete correct grid. The tool also tells you the instant you have won, so there's no need to score it by hand.
Because everything runs locally in your browser, puzzles appear instantly and nothing you type is ever sent to a server. There are no ads, accounts, or usage limits, so you can play as many online Sudoku games as you like. The grid uses theme-neutral borders that stay clear in both light and dark mode, and it works on desktop and mobile, so you can play on your phone the same way you would on a laptop. Your entries stay on your device and never leave it.
Frequently asked questions
- Is this Sudoku game free to play online?
- Yes, it is completely free to play online. There is no sign-up, subscription, download, or usage limit. You can generate and solve as many puzzles as you want at no cost.
- Can I play Sudoku online without downloading anything?
- Yes. The game loads and runs entirely in your web browser, so there is nothing to install or download. Just open the page and press New Game to start a fresh puzzle.
- How do you play Sudoku?
- Fill every empty cell with a digit from 1 to 9 so that each row, each column, and each 3x3 box contains all nine numbers with no repeats. The clues already placed on the grid guide you, and there is exactly one solution that fits every rule.
- How does the difficulty setting work?
- Difficulty controls how many starting numbers (clues) are revealed. Easy leaves about 40 clues, Medium about 32, and Hard about 26. Fewer clues means you have to deduce more of the grid yourself.
- Is this like the NYT Sudoku?
- It is an independent, free alternative and is not affiliated with the New York Times. It plays the same classic 9x9 Sudoku with Easy, Medium, and Hard difficulty levels, so if you enjoy the NYT puzzle you can play unlimited puzzles here without a subscription.
- Does every puzzle have a unique solution?
- Yes. When cells are removed to create the puzzle, the generator verifies that only one valid completion remains, so there is always exactly one correct answer that matches the solution.
- What do the New Game, Check, and Solve buttons do?
- New Game creates a fresh puzzle at the selected difficulty. Check highlights in red any cells that break Sudoku rules or differ from the solution. Solve fills in the complete correct grid for you.
- How do I win the game?
- You win automatically the moment every cell matches the solution, and a completion message appears. You do not need to press anything to score it—the tool checks the grid for you as you fill it in.
- Can I play Sudoku on my phone?
- Yes. The grid is responsive and works on desktop and mobile, so you can play the same puzzles on a phone or tablet as you would on a laptop. It also uses theme-neutral borders that stay readable in both light and dark mode.
- Is my activity private?
- Yes. The entire game runs in your browser using JavaScript. Puzzles are generated on your device and your entries never leave your computer or get sent to any server.