Non-Consecutive Sudoku puzzles look like ordinary Sudoku. However, they are extremely extraordinary There is an additional rule which must be followed: two non-consecutive numbers must not be placed next to each other. So, 5 and 6, 9 and 8, 2 and 1 and so on, can never be adjacent. And that's all This changes the Sudoku game quite a bit and it makes it more challenging and fun. But there is more While all puzzles are indeed non-consecutive, there are also many variants of the non-consecutive sudoku variant: Diagonal Non-Consecutive Sudoku Jigsaw Non-Consecutive Sudoku Odd/Even Non-Consecutive Sudoku Greater/Less Non-Consecutive Sudoku Killer Non-Consecutive Sudoku Outside Non-Consecutive Sudoku Overlapping Non-Consecutive puzzles: TwoDoku, Flower and Samurai Sudoku Non-Consecutive Sudoku in various sizes: 6x6, 8x8, 10x10 Frame Non-Consecutive Sudoku There is no other book with all these puzzles : )