What are the rules of Sudoku?

Every row, column and thick line of Sudoku rule contains 1-9, which is not repeated.

Sudoku solutions are all derived from rules, and the basic solutions are divided into two ideas, one is intuitive method, and the other is candidate number method. More complex solutions will eventually fall into these two categories.

Sudoku is a logical game that uses paper and pen to calculate. Players need to infer the numbers of all remaining spaces according to the known numbers on the 9×9 disk, and ensure that the numbers in each row, column and thick line palace contain 1-9 without repetition.

Every qualified Sudoku puzzle has a unique answer, and the reasoning method is based on it. Any problem with no solution or multiple solutions is unqualified.