Sudoku
Fill a 9x9 grid with numbers 1-9 so that each row, column, and 3x3 box contains each number only once in this classic logic puzzle game!
Free Online Play Sudoku
Fill a 9x9 grid with numbers 1-9 so each number appears once in every row, column, and 3x3 box.
Logic-Based Puzzle
Solve the puzzle using pure logic and reasoning. Each Sudoku has a unique solution that can be reached without guessing.
Multiple Difficulty Levels
Challenge yourself with puzzles ranging from easy to expert. Start with more clues as a beginner and progress to harder grids with fewer initial numbers.
Brain Training
Improve concentration, memory and logical thinking. Regular Sudoku solving has been shown to help maintain mental sharpness and cognitive skills.
Welcome to Sudoku Online
Sudoku is a classic logic-based number placement puzzle that has captivated puzzle enthusiasts worldwide. It features a 9x9 grid divided into nine 3x3 boxes where players must fill each cell with numbers from 1 to 9 following specific rules.
The challenge lies in ensuring that each number appears exactly once in every row, column, and 3x3 box. This simple yet elegant constraint creates a puzzle that rewards logical thinking, pattern recognition, and strategic planning rather than guesswork.
Sudoku is perfect for players of all ages who enjoy logical puzzles, strategic thinking, and the satisfaction of solving increasingly challenging grids through patience and deductive reasoning!
Sudoku Key Features
Discover what makes Sudoku an addictive and challenging logic puzzle game
Logic Grid Puzzle
Fill a 9x9 grid with numbers 1-9 ensuring each number appears once in every row, column, and 3x3 box
Deductive Reasoning
Use logical deduction and elimination to solve puzzles—no guesswork required, just pure reasoning and pattern recognition
Multiple Difficulty Levels
Challenge yourself with puzzles ranging from easy to expert, with varying numbers of initial clues and required techniques
Brain Training
Improve concentration, memory, and problem-solving skills while enjoying a relaxing yet mentally stimulating activity
How To Play Sudoku
Basic Rules
Sudoku is played on a 9x9 grid divided into nine 3x3 boxes. The goal is to fill each empty cell with numbers from 1 to 9, ensuring that each number appears exactly once in every row, column, and 3x3 box. Start with the given numbers as clues and use logic to determine the rest.
Solving Techniques
When solving Sudoku, use the process of elimination to identify possible numbers for each cell. Look for cells with the fewest possibilities and fill those first. Scan rows, columns, and boxes to eliminate options. Remember, Sudoku rewards patience and logical thinking—never guess! Each puzzle has only one correct solution that can be reached through deductive reasoning.
Difficulty Levels & Completion
Sudoku puzzles come in various difficulty levels from easy to expert. Beginners should start with easier puzzles that have more initial numbers (clues). As you improve, challenge yourself with harder puzzles that require more advanced techniques. A puzzle is complete when all 81 cells are filled correctly with no duplicates in any row, column, or box. Track your solving time to measure your progress!
Sudoku Gameplay
Watch how to play Sudoku and learn the best strategies to find theme words and spangrams!
What Players Say About Sudoku
See what our community thinks about their Sudoku experience. Join thousands of logic puzzle enthusiasts today!
LogicFan
Sudoku is so addictive! Completing a difficult puzzle is incredibly satisfying. It's become my daily brain workout.
2 hours ago
PuzzleMaster
Perfect logic challenge! The puzzles are challenging but never impossible. I love how each difficulty level builds your skills.
1 day ago
NumberWhiz
Runs great on my laptop. I can take my time with no pressure, making it perfect for short breaks during work.
3 days ago
BrainTrainer
Sudoku is educational too! My kids are developing logical thinking skills while having fun with the easier puzzles.
1 week ago
PatternSeeker
Great balance of challenge and relaxation. Works for quick or long sessions. Multiple difficulty levels keep it fresh!
2 weeks ago
PuzzleEnthusiast
Sudoku is so calming compared to other games. I can focus on pure logic without time pressure. It's improved my concentration skills!
1 month ago
Frequently Asked Questions About Sudoku
Discover answers to common questions about Sudoku and learn how to improve your skills in this engaging logic-based number puzzle game.
Sudoku is a logic-based number placement puzzle. It features a 9x9 grid divided into nine 3x3 boxes. The objective is to fill the grid with digits from 1 to 9, ensuring that each column, each row, and each 3x3 box contains all digits from 1 to 9 without repetition. It's a game of logical thinking that requires no mathematical calculations.
To play Sudoku, you need to fill the 9x9 grid with numbers 1-9 so that each row, column, and 3x3 box contains all digits exactly once. Start by analyzing the given numbers and use logic to determine which numbers can go where. The process involves elimination and pattern recognition rather than guessing. As you progress, the puzzle becomes more complete, making it easier to place the remaining numbers.
Yes, Sudoku is completely free to play on our website. You don't need to pay anything or create an account to enjoy the full game experience. Just visit our site and start playing immediately with puzzles of various difficulty levels.
Sudoku stands out with its pure logic-based approach that requires no mathematical calculations or special knowledge. Unlike many puzzles that rely on vocabulary or specific skills, Sudoku is universally accessible. The game offers a perfect balance of challenge and satisfaction, with puzzles ranging from beginner to expert levels. Each puzzle has exactly one solution, making the experience both challenging and rewarding.
Regular Sudoku play offers numerous cognitive benefits, including improved concentration, enhanced memory, and better logical thinking skills. It helps reduce anxiety and stress by promoting a state of flow and mental focus. Studies suggest that puzzle games like Sudoku may help maintain brain function, with some research indicating that regular players have brain function equivalent to people 10 years younger than their actual age.
Yes, Sudoku comes in various difficulty levels from easy to expert. Easier puzzles have more numbers filled in at the start, while harder ones provide fewer initial clues. Beginners should start with easy puzzles to learn the basic techniques before progressing to more challenging levels that require advanced solving strategies and deeper logical thinking.
If you're stuck, try scanning the grid for rows, columns, or boxes that are nearly complete and focus on those. Look for 'candidate numbers' in each empty cell by eliminating possibilities based on existing numbers. Sometimes, taking a short break helps you return with fresh eyes. For more difficult puzzles, techniques like 'pencil marking' (noting possible numbers in each cell) can be very helpful. Remember, Sudoku is solved through logic, not guessing.