Sudoku is a numerical puzzle with a square field of 9x9 cells inside, that is, 81 cells in total. Sudoku is also called a magic square. The square is divided into 9 small squares, 3x3 cells. At the beginning of the game, some cells has hints inside, the numbers from 1 to 9. The player's task is to fill the remaining empty cells with numbers from 1 to 9 so that the following three conditions are met: * Numbers should not be repeated in one column; * Numbers should not be repeated in one line; * Numbers should not be repeated in a small square (3x3). The difficulty of Sudoku depends on the initial number of hints. The more hints, the easier Sudoku is. Easy Sudoku can be solved in a few minutes. To solve a hard Sudoku, it may take more than an hour. sudoku, online sudoku, play sudoku, sudoku rules, sudoku 2018, easy sudoku, hard sudoku, sudoku 9x9
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