Play a classic Sudoku game.
Fill free cells with digits from 1 to 9.
You can put numbers so that in a row, in a column
and in a small square 3x3 the digits were encountered only once. Sudoku, Sudoku game, number puzzle, logic puzzle, brain training, mental exercise, online Sudoku, simple Sudoku, number placement, row, column, 3x3 square, puzzle game, cognitive skills, stress relief, problem solving, number game, free online puzzle