Sudoku
sudoku: quick guide and game info
Sudoku is the ultimate number puzzle game that trains your brain and delivers satisfying “aha!” moments. Fill the 9×9 grid so every row, column, and 3×3 box contains the digits 1 through 9 exactly once.
On our site you can play Easy, Medium, or Hard puzzles. You get 4 mistakes per game, 3 hints, and a handy notes mode (pencil marks) to track possible numbers. A timer starts automatically when you begin a new puzzle so you can chase your best times in each difficulty. It is free, relaxing, and perfect for daily brain training on any device.
game layout and setup
Sudoku is played on a 9×9 grid divided into smaller 3×3 boxes. Some numbers are already filled in at the start, and your job is to complete the rest.
Each game includes:
- A 9×9 Sudoku board
- Pre-filled starting numbers
- Easy, Medium, and Hard modes
- 4 allowed mistakes
- 3 hints per game
- Optional Notes Mode
- A time tracker for your current session
Harder levels usually start with fewer clues and require more careful logic.
how to play sudoku
Sudoku rules are simple.
- Choose Easy, Medium, or Hard.
- Click or tap an empty cell and choose a number from 1 to 9.
- Make sure the number does not already appear in the same row, column, or 3×3 box.
- Use Notes mode to pencil in possible candidates when you are not 100% sure.
- Use hints carefully since you only get 3 per game.
- Complete the board before reaching 4 mistakes.
Notes Mode is especially useful when you want to plan ahead and keep track of which numbers are still possible for each square. The timer starts as soon as you place your first number. Try to beat your personal best times on Easy, Medium, or Hard!
how to win at sudoku
Beating a Sudoku puzzle is all about logic and patience:
- Start with the easiest clues. Look for rows, columns, or boxes that are nearly full.
- Use Notes mode to eliminate possibilities and spot hidden singles.
- Watch your mistake counter and use hints only when truly needed.
- On Hard puzzles, advanced techniques like naked pairs or X-wing patterns become very useful.
The more you play, the faster and sharper you will get. Challenge yourself to improve your solving time in each difficulty level.
a little bit of sudoku history
Sudoku as we know it was invented by American architect Howard Garns in 1979 and first published as “Number Place.” It exploded in popularity in Japan in the 1980s, where it earned the name Sudoku (meaning “single digits”).
The puzzle spread worldwide in the mid-2000s and became a daily staple in newspapers and apps. Today millions of people enjoy Sudoku for its perfect balance of logic, deduction, and mental satisfaction.
Ready to solve? Pick Easy, Medium, or Hard, start the timer, and see how quickly you can fill the grid. Good luck and happy puzzling!
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