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When you type the word Sudoku, I believe you already know what this is, however, do you really define this game and understand it deeply? Let's learn a little about this classic game!

What is Sudoku?

Sudoku also has another name that few people know as Number Place, is a number arrangement game based on the combination of natural numbers from 1 to 9, over time, this game has many different versions. But according to the original version, this is a 9x9 square game, your task is to fill in any number from 1 to 9 in each small square (according to the rules of the game we will learn later), and each box contains only an only number.

How to play sudoku?

Sudoku has many variations but only changes in the size and number of tiles in the game and the basic gameplay remains the same.

And here, we talk about the original version of the game.

The entire interface of the game consists of 9x9 squares, and is differentiated into 9 small 3x3 grids, they are distinguished from each other by the surrounding border more prominent than the dividing line between the small squares, you Looking at the interface of the game will easily recognize these 9 separate grids.

Although they are said to be separate, they are actually related to each other.

First, depending on your initial selection (easy, medium, or hard) there will be a certain amount of pre-filled squares with numbers that belong to it. And we do the problem solving from these numbers.

Next, we need to understand the overview of how to play as follows:

Each 3x3 grid will have to contain all 9 numbers from 1 to 9.

Each horizontal row also needs to contain all 9 numbers from 1 to 9.

Each vertical row (column) also needs to contain all 9 numbers from 1 to 9.

There are other conditions as Each row, each column, each 3x3 grid does not allow any number to exist a second time, of course, because that will cause in that row, column or 3x3 grid there will not be any other conditions enough 9 numbers from 1 to 9 (this point is very important to be able to solve this game).

Step 1: Choose one of three elements: a 3x3 grid, the row or column containing the most numbers. And determine which numbers are missing in your selected area.

Step 2: Start testing from 1 to 9 (or in an order that you control).

Step 3: From the position of the first missing number you choose, check if the row and column passing that number already exist, if not (or all blank) you can "temporarily" assign numeric value for this position.

Step 4: continue the next number.

Step 5: When more numbers appear in the game interface, return to Step 3 (and can use more exclusion methods) to be sure of the value to fill for each specific cell.

Note: You can use the following exclusion method: for example, you see that the row above and below the position you have selected both has a 1, your 3x3 grid does not have a 1, so the number is 1 one of this 3x3 grid must be in 1 of the 3 squares in the middle row. This method will help you localize the value for each row or column in a 3x3 grid (sometimes you have to save it to the end to complete).

Keep repeating the above steps, you will be able to finish this Sudoku game very quickly.

A hint for you: If you are having trouble determining the value for a square, or the position for a number (you will probably hesitate when at some point, you have 2 squares for you choose to fill in a number), don't rush or focus too much on it, ignore this option for the time being, and determine your next goal and tackle it.

As you complete more and more small squares correctly, the previous problem or previous confusion will become more and more clear.

Remember, in this game, each square will have only one value, and that value is constant, so far, no one has found a second answer to an original hint.

If you are a newbie to this game, congratulations on joining the community of lovers of today's best brain training and difficulty game that is Sudoku.

And one suggestion for you, start from the easiest level because that will help you adapt to this game faster, however, if it's boring, you should choose the harder level to keep training and challenge yourself!

When the sudoku game with a 9x9 grid can no longer give you a hard time, you can learn about other variations, now there are quite a few Sudoku variations that challenge players with different sizes such as:

* 4x4 grid (divide the area by 2x2 sub-grid).

* 5x4 grid (divided by Pentomino).

* 6x6 grid (divide the area by 2x3 sub-grid).

* Grid 7x7 (division by Pentomino).

* 8x8 grid (divided into 4x2 sub-grid).

But those are just small sizes, and larger sizes like 12x12, 16x16, 25x25 are called Giant Sudoku or with the cool name Samurai Sudoku.

And the size 100x100 is currently the most difficult level to challenge players around the world.

Controls guide

If you still have doubts about how to play this Sudoku, read the instructions above to get the most detailed instructions! If you already know how to play, wish you have the most relaxing moments!

If you know how to play, but don't have any optimization methods, read the instructions above, I believe there will be a suggestion for you.