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Sudoku is a number placing puzzle based on a 9x9 grid with severalgiven numbers. The object is to place the numbers 1 to 9 in theempty squares so that each row, each column and each 3x3 boxcontains the same number only once. There are other variations of8x8 and 6x6. Sudoku puzzles come in endless number combinations andrange from very easy to extremely difficult taking anything fromfive minutes to several hours to solve. Sudoku puzzles also come inmany variants, each variant looking differently and each variantoffering a unique twist of brain challenging logic. The rules rSimple but in reality it is highly challenging. After much thoughtn consideration, u will feel an awesome sense of achievement andthis will spur u on to compete in more challenges!