Classic Sudoku is a classic version of the Sudoku game, there are quite a few people who are not happy with its ending, and I also find this to be a faulty design. However, we can completely end this game. I say sorry because this game has only one problem and one answer, compared to modern versions like today, every time you start a new turn will be a completely new puzzle compared to before, and also more levels for you to choose from, the interface is also nicer, and this game is not like that! But Classic Sudoku will be very suitable for new players, and those who want to practice their skills in this game.
Please fill in each blank with a number so that the rule is correct: each grid of 3x3 squares, each row, and each column has a sequence of natural numbers from 1 to 9.