Sudoku is one of the most famous puzzle games based on the logical arrangement of numbers. It originated in Japan and was later popularized all over the world. It is the duty of each player in Sudoku to fill in the appropriate numbers in a 9-by-9 grid such that each row, each column, and the 3×3 section contains all the digits from 1 to 9. It is evaluated as one of the greatest brain games as it challenges players to reason logically and maintain their patience. Sudoku does not require you to solve tough math problems or special math skills, on the contrary, it does stretch your mind and improves your focus as you understand it. Providing you play Sudoku on a regular basis, you will notice your own improvement in concentration and brain flexibility. People can play Sudoku online for free, whether adults or students, this game is a great choice for entertainment and improving thinking.

The Math Behind Sudoku

To be more specific, the standard version of Sudoku consists of a 9×9 square grid containing 81 small squares and nine 3×3 blocks with 9 small squares for each. There will be small squares pre-filled with one of the numbers 1 to 9. At this point, the player has to fill the rest small squares using those nine digits so that the squares in each row, each column, and each 3x3 block contains each number exactly once. This is a binding rule.

In addition to the standard version, Sudoku online players have many other variations with the number of squares being increased or decreased. Calling the above description a Sudoku of rank 3, a Sudoku of rank n would have a grid of n2 × n2 squares, divided into n2 blocks, each size n × n. The numbers used to fill the grid are 1, 2, 3, ..., n2, and a similar rule is applied. However, the standard version is still the most popular and most chosen by many people.

How to play

 Before you start playing, you need to remember the following points,

- A move is incorrect if one of the numbers 1 to 9 appears more than once in a row.
- A move is incorrect if one of the numbers 1 to 9 appears more than once in a column.
- A move is incorrect if one of the numbers 1 to 9 appears more than once in the 3x3 grid.

Use your logic to fill in the missing cells and complete the grid.

To be more specific, we take a 3x3 grid as an example, whereby if in a 3x3 grid there are digits including 2,8,1,5. The player's task will have to fill in the remaining empty cells with the numbers 3, 4, 6, 7, and 9. To figure out where the digit position should be, you need to look at the rows or columns to see what numbers are missing. Use the process of elimination and logical inference to decide the position of the digits in the grid.

Make the same apply if you choose to start with a row or a column.

Tips to Play Sudoku

Sudoku is a great game to entertain and equally fun if you understand it. However, for many beginners, playing Sudoku can seem quite challenging. If you are in a similar situation, some of the following Sudoku tips may be of some help to improve your skills.

Stop guessing: Sudoku is a logic game. Therefore, if you use the guessing method, you will lose a lot of time but still not solve it. In case your grid is too difficult, skim through every area of ​​the grid to find an opportunity to land a number. Although online Sudoku games will greatly appreciate those who solve it quickly, you should not force yourself because it is a game of wisdom and patience, not a game of chance.

Start with 3x3 grids containing 5 or more digits: Look for 3x3 grids containing 5 or more given numbers and fill the remaining blanks with unused digits. If you apply this way, you will have to keep an eye on the rows and columns that contain unfilled cells to see what numbers can be eliminated. This is the way that most Sudoku players apply to solve it in the fastest way.

It is a fact that the rules of Sudoku are not as complicated as you think, but it is actually an extremely diverse game with millions of possible combinations of numbers. If you play Sudoku online here you can also choose from different difficulty levels including Easy, Medium, and Hard. All are based on the same principles. To conquer it, all you need to do is fill in the gaps based on logical reasoning and make sure there aren't any duplicated digits in each grid, row, or column.

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