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The purpose of sudoku is filling an 9x9 grid in such a way that each column row and 3x3 grid contains numbers from 1 to 9. Online sudoke games online is a great option that can be played in a browser. When you start the game, a portion of the 9x9 grid will be filled. Your job is to fill in the missing numbers and the entire grid using logic. Remember, your move is invalid If a row contains duplicate numbers from 1 to 9; or if any column has duplicate numbers between 1 and 9. Simply follow these rules, and you'll succeed.