XiHua Number is a classic sudoku game for beginners and advanced players.
To play XiHua Number well, you should first understand its features and requirements, and then apply some principles and techniques. Benefits:
1. Use the exclusion method to fill in the rows or columns that can be determined
2. Give priority to the row or column with the least space
3. After applying the above two principles to fill in the rows and columns with the least definite and space, and the other rows or columns have certain Numbers, repeat the first two principles to fill in the blanks