All Diagonal Sudoku puzzles contain the "X" factor: numbers cannot be repeated on the diagonals. But that's not all. In this book, however, there are Sudoku X puzzles of different sorts: 10 diagonal puzzles 8x8 in size 50 classic 9x9 Diagonal Sudoku X puzzles 10 Sudoku X puzzles 10x10 in size 10 Jigsaw Diagonal Sudoku X 10 Diagonal Windoku X 10 Diagonal Tridoku (extra special ) 10 Consecutive Sudoku X 10 NON-Consecutive Sudoku X 20 Outside Sudoku X 10 Diagonal TwoDoku X 10 Diagonal Outside TwoDoku X Are you ready for this X rated challenge? Enjoy