Sudoku X

This game is the same as sudoku, except that there is an additional constraint that the numbers in the diagonals must not repeat. In this game there will be a grid of 9 x 9 squares, each small grid of 3 x 3 squares is further grouped in to small groups. The object of this game is to fill in the squares with numbers 1 - 9 in such a way that the numbers in each row or column or diagonal must not repeat, and also the numbers in each small group must