DoubleBlockDoku 6 x 6 + RekutoDoku 12 x 12 + BONUS: 250 logical puzzles = 50 EASY + 50 MEDIUM + 50 HARD + 50 VERY HARD + 50 Very hard + prize 250 classic Killer Sudoku + Large Print + Solutions + Examples

- 200 amusing Double-block puzzles + 50 rekuto puzzles + surprise in 250 Classic Killer Sudoku puzzle - very hard levels (need to download and print)- all riddles have only one verified solution- 2 puzzles on 1 page, very practical and convenient- a lot of free space for the progress of your thoughts- good mind support in the excellent form- large font- develops memory, logical thinking, helps to focus- creative possibilities are expandingIdeal gift for all fans of puzzles. An excellent book for free time and learning of the mind. I hope you enjoy the book. I would be very grateful if you write a review.Best regards,Andrii Pitenko