How to Play Sudoku – A Step-by-Step Guide

Rules of Sudoku

Sudoku is a logic-based puzzle game that is played on a grid of 9×9 squares. The grid is divided into 9 smaller squares of 3×3 squares. The objective of the game is to fill in every square in the grid with a number from 1 to 9. However, each number can only be used once in each row, column, and smaller 3×3 square.

To start the game, some squares will already have numbers in them. These are called “givens”. The player’s task is to fill in the remaining squares with the appropriate numbers while following the rules.

One important thing to keep in mind is that there is only one correct solution for each Sudoku puzzle. If there is more than one solution, the puzzle is not valid.

The rules of Sudoku may seem simple, but the game can be quite challenging, even for experienced players. With practice and patience, however, anyone can become a skilled Sudoku solver.

Strategies for Solving Sudoku Puzzles

There are several strategies that can be used to solve Sudoku puzzles. Some of the most common ones include:

  1. Scanning – This involves scanning each row, column, and 3×3 square to identify which numbers are missing. Once you have identified the missing numbers, you can start filling them in.

  2. Crosshatching – This strategy involves looking at a row or column and identifying which numbers are missing. Then, you can “crosshatch” by looking at the 3×3 square that intersects with the row or column and seeing which numbers are missing there.

  3. Penciling – This strategy involves using a pencil to write down all the possible numbers for each square. As you solve more squares, you can erase the numbers that are no longer possible.

  4. Naked Pairs/Triples – This strategy involves identifying pairs or triples of squares that can only have two or three possible numbers. Once you have identified these pairs or triples, you can eliminate those numbers from other squares in the same row, column, or 3×3 square.

  5. X-Wing – This strategy involves identifying two rows or columns where a number can only appear twice in each row or column. Once you have identified these rows or columns, you can eliminate that number from other squares in the same row or column.

By using these strategies and others, you can become a more efficient Sudoku solver and tackle even the most challenging puzzles.

Tips for Beginners

If you are new to Sudoku, it can seem overwhelming at first. However, with a few tips, you can start solving puzzles like a pro in no time.

  1. Start with easy puzzles – Sudoku puzzles are typically ranked by difficulty, so start with the easy ones before moving on to harder ones.

  2. Use pencil and eraser – It’s easy to make mistakes when solving Sudoku puzzles, so always use a pencil and eraser to avoid having to start over.

  3. Work systematically – To avoid getting confused, work on one row, column, or 3×3 square at a time. This will help you stay organized and focused.

  4. Practice scanning – Scanning is one of the most important strategies for solving Sudoku puzzles. Practice scanning each row, column, and 3×3 square to identify missing numbers.

  5. Take breaks – If you get stuck on a puzzle, take a break and come back to it later. Sometimes, a fresh perspective can help you solve a puzzle that seemed impossible.

By following these tips and practicing regularly, you can become a confident and skilled Sudoku solver.

Advanced Techniques for Expert Players

For expert Sudoku players, there are several advanced techniques that can be used to solve even the most difficult puzzles. Some of these techniques include:

  1. Swordfish – This technique is similar to the X-wing strategy but involves three rows or columns instead of two.

  2. XY-Wing – This technique involves identifying three squares that form a “wing” and using logic to eliminate possibilities.

  3. XYZ-Wing – This technique is a variation of the XY-wing strategy and involves identifying three squares that form a “wing” with three different numbers.

  4. WXYZ-Wing – This technique is a more complex version of the XYZ-wing strategy and involves identifying four squares that form a “wing” with four different numbers.

  5. Jellyfish – This technique involves identifying four rows or columns where a number can only appear in four squares in each row or column.

These advanced techniques require a high level of skill and concentration to master. However, with practice and patience, expert players can use these strategies to solve even the most challenging Sudoku puzzles.


Sudoku is a challenging and enjoyable puzzle game that can be enjoyed by people of all ages and skill levels. By following the rules, using basic strategies, and practicing regularly, anyone can become a confident Sudoku solver.

For those who want to take their Sudoku skills to the next level, there are advanced techniques that can be learned and mastered. However, it’s important to remember that even the most skilled Sudoku players started as beginners and worked their way up.

So whether you are just starting out or are an experienced player, remember to have fun and enjoy the challenge of Sudoku. With patience, persistence, and a little bit of strategy, you can solve even the most difficult puzzles and become a Sudoku master.

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