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September 9 - International Sudoku Day
International Sudoku Day is celebrated every year on September 9. It's a day dedicated to the popular Sudoku puzzle game, which involves filling a 9×9 grid with the numbers 1 through 9 so that each row, column, and 3×3 sub the grid contains each number once.
The aim of International Sudoku Day is to promote and celebrate the game of sudoku and to raise awareness of the benefits it offers. Sudoku is known to improve logical thinking, memory, concentration and problem solving skills. It has become a hobby of millions of people around the world.