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Classic Sudoku Puzzles for All Levels on - Classic Sudoku

If you are looking for a fun and challenging way to exercise your brain, you might want to check out , a website that offers thousands of free sudoku puzzles for all levels of difficulty. Sudoku is one of the most popular puzzle games in the world, and is the best place to play it online.


Sudoku is a logic-based number-placement puzzle that originated in Switzerland in the 18th century as a variation of Latin squares. It was later popularized in Japan in the 1980s, where it got its name, which means "single number". The modern version of sudoku was invented by Howard Garns, an American puzzle constructor, who published it in 1979 under the name "Number Place". Sudoku became a global phenomenon in the 2000s, thanks to the efforts of Wayne Gould, a New Zealand judge who developed a computer program to generate sudoku puzzles and introduced them to newspapers around the world. - classic sudoku


The goal of sudoku is to fill a 9x9 grid with digits from 1 to 9, so that each row, column, and 3x3 subgrid (also called "box", "block", or "region") contains all of the digits exactly once. The puzzle setter provides a partially completed grid, which has a unique solution. To solve a sudoku puzzle, you need to use logic and deduction, not guesswork or arithmetic.

How to play

Here are some basic steps to play sudoku:

  • Select a difficulty level from easy to expert on

  • Click on an empty cell on the grid and choose a number from 1 to 9 from the keypad below.

  • If you are not sure about a number, you can use notes to write small numbers inside the cell.

  • If you make a mistake, you can use undo or erase buttons to correct it.

  • If you need some help, you can use hints, auto-check, or highlight duplicates features.

  • Keep filling in the empty cells until you complete the grid.

Tips and strategies

Here are some tips and strategies to improve your sudoku skills:

  • Look for rows, columns, or boxes that contain five or more numbers. Work through the remaining empty cells, trying the numbers that have not been used.

  • Break the grid up visually into three columns and three rows. Each large column will have three 3x3 grids and each row will have three 3x3 grids. Now, look for columns or grids that have two of the same number. Logically, there must be a third copy of the same number in the only remaining 9-cell section. Look at each of the remaining nine positions and see if you can find the location of the missing number.

  • Use cross-hatching and penciling in techniques. Cross-hatching is a way to eliminate numbers from rows and columns within a box. Penciling in is a way to write down possible numbers in empty cells after cross-hatching.

  • Look for hidden singles, pairs, or triples. Hidden singles are numbers that can only go in one cell in a row, column, or box. Hidden pairs are two numbers that can only go in two cells in a row, column, or box. Hidden triples are three numbers that can only go in three cells in a row, column, or box.


Sudoku is not only fun but also beneficial for your brain and mental health. Here are some of the benefits. Some of the benefits of sudoku are:

  • Boosting concentration: Sudoku requires you to focus on the grid and use logical thinking to find the solution. This helps you to block out distractions and improve your attention span.

  • Teaching patience: Sudoku can be challenging and frustrating at times, but it also teaches you to be patient and persistent. You learn to work through the puzzle step by step, without giving up or losing your temper.

  • Nurturing a healthy mindset: Sudoku can help you to develop a positive attitude and a growth mindset. You learn to enjoy the process of solving problems, rather than just the outcome. You also learn from your mistakes and improve your skills over time.

  • Improving memory and recall: Sudoku can help you to enhance your short-term and long-term memory. You need to remember the numbers that you have placed or eliminated in the grid, as well as the rules and strategies that you have learned. This can also improve your recall of other information in your life.

  • Enhancing spatial reasoning: Sudoku can help you to sharpen your spatial reasoning skills, which are important for many tasks such as reading maps, navigating directions, or playing chess. You need to visualize the grid and the numbers in different positions, as well as recognize patterns and relationships among them.

  • Boosting logical thinking: Sudoku can help you to strengthen your logical thinking skills, which are essential for making decisions, solving problems, and reasoning critically in various situations. You need to apply logic and deduction to fill in the grid correctly, without guessing or relying on arithmetic.

  • Reducing anxiety and stress: Sudoku can help you to relax and calm your mind, by providing a distraction from your worries and a sense of achievement. Sudoku can also stimulate the production of dopamine, a neurotransmitter that regulates mood, motivation, and pleasure.


If you want to spice up your sudoku experience, you can try some of the sudoku variations and challenges available on These include:

  • Different grid sizes: You can choose from 4x4, 6x6, 9x9, or 16x16 grids, depending on your preference and skill level. The smaller grids are easier and faster to solve, while the larger grids are more complex and time-consuming.

  • Color sudoku: You can play sudoku with colors instead of numbers, which adds a new dimension to the puzzle. You need to fill in the grid with different colors, so that each row, column, and box contains all of the colors exactly once. The colors can also be used to define regions or clues in some variations.

  • Image or symbol sudoku: You can play sudoku with images or symbols instead of numbers, which makes the puzzle more fun and creative. You need to fill in the grid with different images or symbols, so that each row, column, and box contains all of them exactly once. The images or symbols can be anything from animals, fruits, flowers, shapes, letters, emojis, etc.

  • Word sudoku: You can play sudoku with words instead of numbers, which makes the puzzle more challenging and educational. You need to fill in the grid with letters, so that each row, column, and box contains all of the letters exactly once. The letters can also form words horizontally or vertically in some variations.

  • Jigsaw sudoku: You can play sudoku with irregular shapes instead of boxes, which makes the puzzle more interesting and unpredictable. You need to fill in the grid with numbers from 1 to 9, so that each row, column, and shape contains all of the numbers exactly once. The shapes can vary in size and form in different puzzles.

  • Samurai sudoku: You can play sudoku with five overlapping grids instead of one, which makes the puzzle more difficult and exciting. You need to fill in all five grids with numbers from 1 to 9, so that each row, column, box, and region contains all of the numbers exactly once. The regions are where the grids overlap with each other.


Sudoku is a great game for anyone who loves puzzles and logic. It offers many benefits for your brain and mental health, such as improving concentration, memory, reasoning, thinking skills, mood, and more. It also provides endless entertainment and challenge for all ages and levels of difficulty.

If you want to If you want to try sudoku for yourself, or if you are already a fan of the game, you should visit and enjoy the best online sudoku experience. You can choose from a variety of sudoku puzzles, ranging from easy to expert, and from classic to colorful. You can also challenge yourself with different sudoku variations, such as jigsaw, samurai, word, and more. You can also track your progress, earn achievements, and compete with other players on the leaderboard. is the ultimate destination for sudoku lovers. Whether you are a beginner or a master, you will find something to suit your taste and skill level. is easy to use, fun to play, and free to access. So what are you waiting for? Grab your device and start playing sudoku today! - classic sudoku puzzles online - classic sudoku game free - classic sudoku solver - classic sudoku tips and tricks - classic sudoku levels - classic sudoku rules - classic sudoku app - classic sudoku download - classic sudoku for beginners - classic sudoku challenge - classic sudoku leaderboard - classic sudoku daily - classic sudoku generator - classic sudoku variations - classic sudoku history - classic sudoku strategy - classic sudoku tutorial - classic sudoku printables - classic sudoku reviews - classic sudoku cheats - classic sudoku fun facts - classic sudoku statistics - classic sudoku themes - classic sudoku timer - classic sudoku difficulty - classic sudoku hints - classic sudoku mistakes - classic sudoku techniques - classic sudoku awards - classic sudoku forum - classic sudoku blog - classic sudoku newsletter - classi


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