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# Free Sudoku 9x9 PDF Files for Beginners and Experts

## Sudoku 9x9 PDF: How to Play and Why It's Good for Your Brain

Sudoku is a popular puzzle game that challenges your logic and reasoning skills. It consists of a 9x9 grid with some numbers already filled in. Your task is to fill in the rest of the grid with numbers from 1 to 9, following some simple rules. Sudoku puzzles can range from easy to hard, depending on the number and placement of the given numbers. In this article, you will learn how to play Sudoku, what techniques you can use to solve it, and why it is good for your brain. You will also find out where you can find Sudoku 9x9 PDF puzzles online or printable.

## What is Sudoku and How to Play It

Sudoku is a Japanese word that means "single number". It was invented by Howard Garns, an American architect, in 1979. He called it "Number Place", but it became popular in Japan in the 1980s, where it was renamed Sudoku. The game gained worldwide popularity in the 2000s, thanks to newspapers, magazines, books, websites, and apps that published Sudoku puzzles regularly.

## sudoku 9x9 pdf

### The Basic Rules of Sudoku

The basic rules of Sudoku are simple:

• You can only use the numbers 1 to 9 in each row, column, and 3x3 box.

• You cannot repeat a number in any row, column, or 3x3 box.

• You have to fill in all the empty cells with numbers from 1 to 9.

Here is an example of a Sudoku puzzle and its solution:

5471

7458

84

8714

6587

496

1

4

5

6

9

2

3

3

2

7

6

4

9

5

1

8

1

7

9

4

2

5

3

6

8

2

3

### 81.6.9.4.5.7.3.2<.t [assistant](#message) r The Techniques to Solve Sudoku

To solve Sudoku puzzles, you need to use some techniques that can help you eliminate the possible candidates for each cell. Some of the common techniques are:

• Naked Single: This is when a cell has only one possible candidate. For example, if a cell is the only one in its row, column, or box that can have the number 5, then you can fill it with 5.

• Hidden Single: This is when a number can only go in one cell in a row, column, or box, but it is not obvious at first glance. For example, if a row has two cells that can have the number 2, but one of them is also in a box that already has a 2, then you can fill the other cell with 2.

• Naked Pair: This is when two cells in a row, column, or box have the same two candidates. For example, if two cells in a column can only have the numbers 3 and 7, then you can eliminate 3 and 7 from the other cells in that column.

• Hidden Pair: This is when two numbers can only go in two cells in a row, column, or box, but they are not obvious at first glance. For example, if a box has four cells that can have the numbers 1 and 4, but two of them are also in rows that already have a 1 and a 4, then you can fill the other two cells with 1 and 4.

• Naked Triple: This is when three cells in a row, column, or box have the same three candidates. For example, if three cells in a row can only have the numbers 2, 4, and 6, then you can eliminate 2, 4, and 6 from the other cells in that row.

• Hidden Triple: This is when three numbers can only go in three cells in a row, column, or box, but they are not obvious at first glance. For example, if a box has six cells that can have the numbers 1, 2, and 3, but three of them are also in columns that already have a 1, 2, and 3, then you can fill the other three cells with 1, 2, and 3.

• Naked Quad: This is when four cells in a row, column, or box have the same four candidates. For example, if four cells in a column can only have the numbers 1, 3, 5, and 7, then you can eliminate 1, 3, 5, and 7 from the other cells in that column.

• Hidden Quad: This is when four numbers can only go in four cells in a row, column, or box, but they are not , hard, and expert. You can also play daily challenges and seasonal events. You can check your statistics and achievements, and join the global leaderboard. You can also download the app for Android or iOS devices.

• [Web Sudoku]: This website offers free Sudoku puzzles in four levels: easy, medium, hard, and evil. You can also play variations such as Jigsaw Sudoku, Killer Sudoku, and Sudoku X. You can print the puzzles or play them online. You can also customize the grid size, color, and font.

• [Sudoku Kingdom]: This website offers free Sudoku puzzles in six levels: very easy, easy, medium, hard, very hard, and fiendish. You can also play Sudoku variants such as Samurai Sudoku, Diagonal Sudoku, Irregular Sudoku, and OddEven Sudoku. You can register for free and save your scores, or play as a guest.

### Printable Sources

If you prefer to play Sudoku 9x9 puzzles on paper, you can find them in printable sources such as books, magazines, newspapers, and PDF files. Some of the advantages of playing on paper are:

• You can use a pencil and an eraser to mark the candidates and erase them.

• You can take the puzzles anywhere and play them anytime.

• You can enjoy the tactile sensation of writing on paper.

• You can avoid eye strain and battery drain from electronic devices.

• You can keep the puzzles as a record of your progress and achievement.

Some of the popular printable sources for Sudoku 9x9 puzzles are:

• [Sudoku Printables]: This website offers free printable Sudoku puzzles in four levels: easy, medium, hard, and very hard. You can also choose the number of puzzles per page, from 1 to 6. You can download the PDF files and print them at your convenience.

• [Sudoku Books]: There are many books that contain Sudoku puzzles in various levels and formats. You can find them in bookstores, libraries, or online shops. Some of the best-selling Sudoku books are The Times Ultimate Killer Su Doku Book 12 by The Times Mind Games, The Must Have 2023 Sudoku Puzzle Book by Jonathan Bloom, and Will Shortz Presents The Huge Book of Hard Sudoku by Will Shortz.

• [Sudoku Magazines]: There are many magazines that publish Sudoku puzzles regularly. You can find them in newsstands, supermarkets, or online subscriptions. Some of the popular Sudoku magazines are Kappa Sudoku Puzzles, Dell Original Sudoku, and Penny Press Selected Puzzles Sudoku.

• [Sudoku Newspapers]: There are many newspapers that feature Sudoku puzzles daily or weekly. You can find them in local or national editions, or online archives. Some of the famous newspapers that offer Sudoku puzzles are The New York Times, The Guardian, and USA Today.

## Conclusion

Sudoku is a fun and challenging game that can improve your brain power and make you happy. It is easy to learn but hard to master. It requires logic, reasoning, memory, concentration, and patience. You can play Sudoku 9x9 puzzles online or printable in various sources. Whether you are a beginner or an expert, you can always find a puzzle that suits your level and preference. So what are you waiting for? Grab a pencil or a device and start playing Sudoku today!

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