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Sudoku is one of the most popular puzzle games of all time. The goal of Sudoku is to fill a 9x9 grid with numbers so that each row, column, and 3x3 section contains all the numbers between 1 and 9. Sudoku is a great brain game as well as a logic puzzle. If you play Sudoku every day, you will soon start to notice improvements in your concentration and overall intelligence. Start playing now. It won't be long before Sudoku becomes your favorite free online game.