Your complete Sudoku resource. Play free puzzles at every difficulty level, learn solving techniques from beginner to expert, and explore the fascinating world of Sudoku.
Difficulty Levels
Easy Sudoku - 36-45 clues. Perfect for beginners learning basic scanning techniques like naked singles and hidden singles.
Medium Sudoku - 30-35 clues. A satisfying challenge requiring pairs and pointing techniques.
Hard Sudoku - 25-29 clues. Tests advanced logic skills with X-Wings and elimination strategies.
Expert Sudoku - 22-28 clues. The ultimate challenge requiring mastery of all techniques including XY-Wing and forcing chains.
Extreme Sudoku - 17-21 clues. Beyond expert, near the mathematical minimum. Demands forcing chains, multi-coloring, and jellyfish.
Daily Puzzle
Challenge yourself with a new puzzle every day. Our daily Sudoku is a great way to build a consistent solving habit and sharpen your logical thinking skills.
Browse Puzzles
Choose from five difficulty levels to find the perfect challenge. Each level uses specific solving techniques, so progressing through them naturally teaches you new strategies.
Master Sudoku Strategies
From basic scanning to advanced pattern recognition, mastering the right strategies at the right time is the key to solving any Sudoku puzzle.
Beginner Strategies - Start with the fundamentals of Sudoku solving, including naked singles and hidden singles.
Intermediate Techniques - Level up with naked pairs, hidden pairs, pointing pairs, and box-line reduction.
Sudoku is a logic-based number placement puzzle played on a 9x9 grid. The goal is to fill every row, column, and 3x3 box with the numbers 1 through 9 without repeating any number.
How do you play Sudoku?
Start by examining the pre-filled numbers (called givens) on the 9x9 grid. Use logic to determine which numbers belong in the empty cells. Each row, column, and 3x3 box must contain the numbers 1 through 9 exactly once. Begin by scanning for cells where only one number can fit, then progress to more advanced elimination techniques as needed.
Is Sudoku good for your brain?
Yes. Research from the University of Exeter shows that adults who regularly solve number puzzles like Sudoku have cognitive function equivalent to people up to 10 years younger. Sudoku exercises working memory, logical reasoning, pattern recognition, and concentration, making it one of the most accessible brain training activities available.
How many clues does a Sudoku puzzle need?
A valid Sudoku puzzle needs at least 17 clues to have a unique solution. Easy puzzles typically have 36-45 clues, while expert puzzles may have as few as 22-24.
Is Sudoku a math puzzle?
No, Sudoku requires no arithmetic. It is a pure logic puzzle that uses numbers as symbols. You could replace the numbers with letters or shapes and the puzzle would work the same way.
How do I get better at Sudoku?
Practice regularly, learn solving techniques progressively (start with naked singles, then hidden singles, pairs, and advanced patterns), use pencil marks to track candidates, and gradually increase the difficulty level.
What is the best Sudoku difficulty for beginners?
Start with easy Sudoku puzzles that have 36 to 45 pre-filled clues. These puzzles can be solved using basic scanning techniques like naked singles and hidden singles. Once you can consistently complete easy puzzles, move up to medium difficulty to learn intermediate strategies like naked pairs.