BHMOLIPOLD

BHMOLIPOLD Sudoku has three levels of difficulty! Here is an introduction tBHMOLIPOLD Sudoku:
Level 1 ：
Please fill in the numbers 1-9 (cannot be repeated).
When the sum of each row, column, and diagonal row is equal, win the game!
Level 2：
Please fill in the numbers 1-9 in the 9 "nine squares" (cannot be repeated)
The goal is to make every row, column, and "nine squares" contain numbers 1-9.
Level 3：
The rules are the same as Level 2! But the numbers prompted are fewer and the difficulty is greater!