"Ultimate Sudoku" Game

Ultimate Sudoku is a math crossword puzzle game that started in Japan. The game is suitable for people who like logic puzzles. First, choose a difficulty level and then proceed to exercise your mind. The rules are complicated only at first glance, but you just have to figure it out. So, you have in front of you a field of nine large squares, each of which contains nine small squares. Your task is to put the numbers in such a way that they do not repeat in row, column and square. The numbers are already present in some of the squares, so that will serve as a good hint for you.