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How do you complete Number-Grid Puzzles?

  • Sudoku? -

    If you are referring to Sudoku, they are puzzles unrelated to math.
    In fact, a sudoku puzzle could be made up of grids of nine celebrities instead of 9 digits!
    The rule of the game (using digits) is to complete the grid so that every row, column and each of the 9 sub-squares of nine cells contain all the nine-digits, once and only once.
    Different techniques are available for the different levels of difficulties of the puzzle.
    Try for example:

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