Black hole puzzles = 250 logical SUDOKU + bonus 250 Labyrinth number games: 100 Patchwork doku 10 x 10 Very hard + 100 Nurikabe Sudoku 10 x 10 Very ha

- 250 pieces of puzzle + surprise in 250 Labyrinth number 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 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