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What are the skills when Sudoku has nine squares and no numbers?
My method is simple. At present, there are two methods: exclusion method and hypothesis method. The first problem can only be successfully completed if it is eliminated.

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Step 1: Look at the nine numbers first. Which number appears more often, nine appears six times and seven appears five times, so let's start with these two numbers.

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In this way, 7 and 9 in the table will be filled in, and these two numbers can be ignored in the future.

Step 2: See if a number appears twice in lines 1-3, 4-6 and 7-9, so that we can infer where another number appears in these three lines or columns. For example, there are 2 in columns 1 and 3, so it is not difficult to conclude that the other 2 is located at the intersection of row 2 and row 2. My habit is to be horizontal first and then vertical.

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In this way, the form is filled with many figures.

Step 3: My habit is to start from the upper left corner. I will find that if I want to satisfy the existence and uniqueness at the same time, I can infer all the numbers.

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The answer came out.

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