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What is Sudoku? Rules of the game and tips for solving Sudoku easily

What is Sudoku? How to play Sudoku are questions that many players often encounter when new to Sudoku. So what is the answer to the above questions? Network Administrator will answer you with the content below.

What is Sudoku?

Sudoku, also known in English as Number Place, is a number-arranging puzzle game based on combinatorial logic. Sudoku will be given a few numbers and located in random positions. The player's task is to fill a 9×9 grid with numbers so that each row, each column, and each of the nine 3×3 sub-grids that make up the main grid contain all the digits from 1 to 9. .

Sudoku first appeared in America with the name Set number position – Number Place. It was then introduced to Japan and renamed Sudoku by publisher Nikoli, which means unique because each cell has only one number. Over time, Sudoku has become a favorite intellectual game in many countries.

Basic rules of Sudoku

Sudoku has many variations, but only the size and number of cells in the game change while the basic gameplay remains the same.

In the standard version (original) the size is only 9×9 (small box) and is divided into 9 areas, each area is 3×3 in size. These areas are grouped and separated from each other by a darker black border than the small cells.

Rules of Rows and Columns in Sudoku

  • Sudoku rules revolve around filling in the numbers 1 to 9 in the empty cells on the 9×9 grid, ensuring the following conditions:

1. Law of Goods:

  • Each horizontal row (from left to right) must contain 9 digits from 1 to 9, without duplicates.
  • The order in which the numbers appear in the row is not important.
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2. Column Law:

  • Similar to the row rule, each vertical column (from top to bottom) must also contain all 9 digits from 1 to 9, without duplicates.

For example:

  • In a row, we cannot have two cells containing the number 5.
  • In a column, we cannot have two cells containing the number 7.

Note:

  • Row and column rules apply to all 9 rows and 9 columns on the Sudoku grid.
  • Complying with row and column rules is a prerequisite for successful Sudoku solving.
  • In addition to row and column rules, Sudoku also has 3×3 block rules. This law stipulates that each 3×3 block (also called “region”, “box”) must also contain all 9 digits from 1 to 9, without duplicates.
  • Combining row, column and 3×3 block rules, players can gradually fill in the numbers in the empty cells, completing Sudoku.

The easiest way to play Sudoku

Basic gameplay

  • Basic technique: Scan rows, columns, and subareas: Identify cells that can only be filled with a single number based on the game rules.
  • Exclusions: Determine which numbers cannot fill a cell based on numbers that already exist in the same row, column, and subrange.

If you are just starting out, you should choose easy levels so you can get used to the gameplay of this game faster. Below is the easiest way to solve Sudoku.

Step 1: When starting the game in this default 9×9 format, start solving the large boxes with the most numbers. Let me give you an example in this bottom right box, if you want to enter the number 1 in this box. Check to see which vertical or horizontal rows have the number 1 appearing and you will not be allowed to enter the number 1 in that row.

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For example, below, you will not be able to enter the number 1 in the cells with red dots because there is already a number 1 in that row. The only box where you can enter the number 1 is the box marked X.

sudoku solving tips

Step 2: Similarly, solve the big box with the most numbers. This will make it easier for you to start the game.

Sudoku stage

Step 3: As in the box above, I cannot fill in the number 3 in the far left row because it will overlap with the number 3 in the row near the right. As for the position in column 3 from the left (between numbers 4 and 7), you cannot fill in number 2.

Sudoku stage

Step 4: Then, when you have solved a large Sudoku box, see which row around that large box has the most numbers. Here I have a top row and a vertical row on the left with only 2 numbers left to solve.

how to solve sudoku

Step 5: Next is a row as shown below, there are only 2 numbers left to complete so just aim for rows with few numbers left to solve.

Instructions for playing sudoku

If the vertical or horizontal row doesn't have many numbers for you to solve, go back to the big boxes to continue solving.

How to play sudoku easily

In addition to the standard 9×9 cell format as shown below and divided into 3×3 areas. There are many other forms such as.

  • Size 4×4 cells divided into 2×2 areas
  • Size 6×6 cells divided into 2×3 areas

sudoku 6x6

  • Size 5×5 cells divided by Pentomino
  • Size 7×7 area divider according to Pentomino
  • Size 8×8 divided by rule area (4×2): (4×2)
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sudoku 6x6

There are also larger sizes such as 16×16, 12×12 divided into 4×3 areas. Or even larger sizes are called Giant Sudoku with 25×25 cells and Samurai Sudoku. The largest variation of Sudoku currently is 100×100 cells.

With the instructions for playing Sudoku according to the article above, you know how to play Sudoku and solve Sudoku in many different ways. At the same time, you also know the variations of Sudoku from difficult to easy.

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