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Suduko Review > Playing Sudoku > Variants > 1 2 3 4 5 6 7
The normal rules for Sudoku puzzles, are that each row, column and box, must feature all the numbers (so, for example, in a 9 X 9 Sudoku, each row column and box, must feature all the numbers 1 through 9).
Sudoku X (also known as Kokonotsu) adds an additional rule, namely that the two main diagonals must also feature all the numbers.
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