Zodiac Sudoku _ Zodiac Sudoku

It's called killer sudoku. This rule requires that the sum of the numbers in the range surrounded by the dotted line is equal to the number in the upper left corner of the dotted line box, except that there is only 1-9 in each row, column and palace.

The specific method is not detailed. Generally speaking, it is to find an exit from each row, column and palace. For example, all the squares in the first row and the second row add up to 90. It happens that there is a grid that contains a grid in the third row, so if you count this grid, the total is 96. Then you can be sure that the box in the third row is filled with 6. Then fill in a certain number of squares, and you can fill them in the ordinary Sudoku way.

In this process, there are always some simple and easy-to-judge examples. For example, two squares add up to 17, which must be 8 and 9; If it is 3, it must be 1 and 2. If two squares in a row are equal to 16, it can only be 7 and 9, never two 8. For example, three squares equals 24, which can only be 7.8.9.

Is there any other way to judge? Yes, there is a killer Sudoku calculator that can help you eliminate some impossible combinations.

The question you gave is so difficult that I won't be able to work it out for a while. I have added it to my collection, so I will do it later when I am free.