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An X-Sudoku is solved just like a classic Sudoku by filling the numbers from 1 to 9 into the blank cells. The difference between a Sudoku and an X-Sudoku is that each of the two main diagonals of an X-Sudoku can contain the numbers from 1 to 9 only once too.
You can download and print X-Sudokus at Print X-Sudoku for free. If you need help or further instruction, you can read the online Manual. For questions about X-Sudoku, see What is X-Sudoku?