Sudoku

The goal of the free online sudoku game on the site is to enter numbers from one to nine into a 9x9 square sudoku cube so that each row and each column can contain only one number, but only once. The tables, which are divided into 9 small squares, must also be filled in so that each number appears once. There are four difficulty levels in the menu: Beginner, Medium and Difficult, as well as 2x2 and 3x3 pitches. If the number you are about to enter is definitely bad at the moment, because the small square or the given row or column already contains the given number then it will appear in red. Otherwise it will turn green, but because of the numbers you enter later, it may be bad later, but then it will not change to red. The player must be retrieved to find out which number he has previously entered.