**The rule: never the same number**

There is only one rule for playing Sudoku: you have to fill the board in such a way that each row, each column and each square contains the numbers from 1 to 9. The condition is that no row, no column or box show the same number twice. In this article, we read about How to play sudoku?

**Tip: Use Reasoning to play sudoku**

To put the first numbers you can guess, but it is much more fun to use reasoning and logic to find the right positions of the numbers. Each number entered correctly is more information to find the others.

**Example: how to get started**

We use the square above as an example to suggest some logical techniques to start playing. Look at the 7s in the vertical series to the left of the three squares. There is a 7 in the upper square, a 7 in the lower square, but there is no 7 in the middle one. The 7 in the top box applies to the entire first column, the 7 in the bottom box also applies to the entire second column.

So the 7 that we need to put in the middlebox will not go to the first and second column, but to the third. Inside the central box, the third column already has two boxes filled in and only one free. That box (marked in the example with the letter A) is the only one that can contain the 7. This technique is called slicing, making slices. Now we see the 7 in the series of boxes at the top of the grid.

The 7 is in the left pane and there is also in the right one, missing in the middle pane. The 7 in the box on the right applies to the entire first row, the 7 in the box on the left applies to the entire second row of boxes. Using the previous logical technique we know that in this case the 7 must be entered in box B or box C. But in the first column of the second box there is a 7, while there is not in the second. Consequently, the 7 must be placed where the letter C is. Going forward and examining the central squares and always the number 7 we see that it is missing in the square to the right of the middle sequence.

**Middle Sequence to play sudoku.**

According to the same arguments already made previously, it is clear that the 7 goes where we put the letter D. The 7 in the box on the right applies to the entire first row, the 7 in the box on the left applies to the entire second row of boxes. Using the previous logical technique we know that in this case the 7 must be entered in box B or box C. But in the first column of the second box, there is a 7, while there is not in the second. Consequently, the 7 must be placed where the letter C is.

Going forward and examining the central squares and always the number 7 we see that it is missing in the square to the right of the middle sequence. According to the same arguments already made previously, it is clear that the 7 goes where we put the letter D.

The 7 in the box on the right applies to the entire first row, the 7 in the box on the left applies to the entire second row of boxes. Using the previous logical technique we know that in this case the 7 must be entered in box B or box C. But in the first column of the second box, there is a 7, while there is not in the second. Consequently, the 7 must be placed where the letter C is. Going forward and examining the central squares and always the number 7 we see. That is missing in the square to the right of the middle sequence. According to the same arguments already made previously. It is clear that the 7 goes where we put the letter D.

**Going Forward and Examining to play sudoku**

But in the first column of the second box, there is a 7, while there is not in the second. Consequently, the 7 must place where the letter C is. Going forward and examining the central squares and always the number 7 we see. That it is missing in the square to the right of the middle sequence. According to the same arguments already made previously. It is clear that the 7 goes where we put the letter D.

But in the first column of the second box, there is a 7, while there is not in the second. Consequently, the 7 must place where the letter C is. Going forward and examining the central squares and always the number 7 we see. That it is missing in the square to the right of the middle sequence. According to the same arguments already made previously. It is clear that the 7 goes where we put the letter D.

**The tools to play sudoku**

**Pencil, eraser and patience** To play Sudoku you just need a pencil, an eraser to erase any mistakes and a little patience. Start with the numbers that are most present, do not guess, think. Enter the number only when you are sure and remember. That for each game the solution is one and only one.

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