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How to play

X-Sudoku puzzle
The rules of X-Sudoku are exactly the same as a normal Sudoku puzzle, but there is one more rule that you need to follow,
  • Both the diagonals must contain the numbers 1-9 once and only once.
This is an example of a X-Sudoku puzzle. You can use all the normal techniques you would use to solve a Sudoku puzzle, but you can also take the two diagonals in to account.
X-Sudoku puzzle
Look at the highlighted cell in this puzzle. We can eliminate the values 1, 2, 4, 6, 7 and 9 using the normal rules of Sudoku.
If you look at the values already in that diagonal, we eliminate the values 2(again), 3, 5 and 9(again). This just leaves us with the value 8. This cell must be 8!
X-Sudoku puzzle
You can also fill in the two highlighted cells. The center cell is on both diagonals, so make sure you consider both diagonals!

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