There’s a reason why Sudoku has taken the world by storm – it’s challenging, addictive, and fun to play. The concept is simple, all you have to do is fill the grid so numbers 1 through 9 are across each row, down each column, and within each 3 x 3 square without any duplicates. Of course, actually accomplishing this is not so simple. Luckily, you can choose your difficulty level.
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