How to solve Sudoku?

Sudoku is a puzzle that requires logic, patience and the ability to solve number problems. I want to share with you my secrets and techniques for solving this fascinating puzzle. In this article, I will use simple language so that beginners can also easily understand and start playing Sudoku.

What is Sudoku?

Sudoku is a puzzle consisting of 9 square blocks, each divided into 9 cells that form a 9×9 grid. In this grid some cells are already filled with numbers from 1 to 9 and your task is to fill the remaining cells so that each row, each column and each small 3×3 square contains all numbers from 1 to 9 without repeats.

Sudoku Rules

1. Playing Field: The Sudoku playing field is a 9×9 square divided into small 3×3 squares called “regions” or “blocks”. Each cell of the field must contain a number between 1 and 9.
2. Initial numbers: At the beginning of the game there are already some numbers on the field, called “source numbers” or “clues”. The aim of the game is to fill the remaining cells in such a way that each number from 1 to 9 occurs only once in each row, each column and each small square 3×3.
3. Filling rules: During the game you should fill the cells with numbers from 1 to 9, observing the following rules:

  • Numbers should not be repeated in one line.
  • Numbers should not repeat in the same column.
  • Numbers should not repeat in one small square 3×3.

4. Hints and logical solution: The initial numbers on the field help you start solving the puzzle. Your task is to use logical thinking and apply different strategies to fill in the remaining squares. You must analyze the numbers provided and, given the rules of the game, determine which numbers can be placed in certain squares.

History of Sudoku

Sudoku is a puzzle that has won millions of hearts around the world. The roots of the puzzle go back to the Middle Ages, to Switzerland. In the late 18th century, Leonhard Euler, a Swiss mathematician, developed the mathematical puzzle that became the progenitor of Sudoku. However, it was not widespread at the time.

The modern Sudoku (as we know it today) was developed by the Japanese Nikoli Co., Ltd. in 1979. They renamed the puzzle “Sudoku,” which means “the number must be single” in Japanese. Sudoku was popular in Japan and gradually spread internationally.

International recognition of the game

In 1997, the British newspaper The Times published Sudoku in its edition, and this was the beginning of a worldwide craze for the puzzle game. Soon many newspapers around the world began to publish Sudoku in their puzzle sections, and it became a popular phenomenon in many countries. Today, with the advent of computers and mobile devices, Sudoku is now available digitally. Online games and apps allow people to play the puzzle anytime, anywhere. This has greatly increased the popularity of Sudoku and attracted new fans to the sport.

My experience solving Sudoku

With my extensive experience playing Sudoku, I have learned various strategies that help me solve complex puzzles quickly and efficiently. Here are some of them:

Use “scanning” rows and columns

The first thing I do when I start solving Sudoku is to scan the rows and columns looking for numbers that might be unique to a particular cell. For example, if there are 8 numbers in a row and only one empty space remains, I can easily determine what number should be in that cell.

Look for “hidden pairs” and “hidden triples”

Sometimes there may be more than one cell in a row or column with the same set of possible numbers. For example, three cells in a row may only have the numbers 2 and 5. Then I know that no other numbers can be in those cells, and I can use that information to solve the puzzle.

Applying the “stepwise exclusion” method

This method is based on looking at each possible number for each cell step by step. I start with the cell with the fewest possible numbers, and stepwise exclude the numbers that are already present in the row, column, or small square. Then I move on to the next cell with the smallest possible numbers and repeat the process. This method allows you to gradually narrow down the options and reach a solution.

Using the “blocking” method

If a certain number is already present in a small 3×3 square, then I can exclude it from the possible choices for the other cells in that square. That way, I block out the number in a certain small square and move on to solve the puzzle.

Applying the “brute force” method

If all other strategies fail, I resort to the brute-force method. I choose the square with the fewest possible numbers and try each number one by one until I find the right solution. This method takes some consistency and patience, but in the end it solves even the most difficult puzzles.


The game of Sudoku is a fascinating puzzle game that develops logical thinking and patience. The experience of a professional Sudoku player can help you tackle the toughest puzzles. Use strategies such as scanning, step-by-step elimination, finding hidden pairs and threes, blocking, and brute-force to reach the puzzle’s solution.

Remember that practice is the key to perfection. Start with simple puzzles and gradually progress to more complex ones. Playing Sudoku not only helps you develop your logical thinking, but it’s also fun and engaging. Don’t be afraid to experiment and you’ll soon become a true Sudoku master!

Good luck solving the puzzles and have fun in the world of Sudoku!

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