Black Hole Puzzles = 250 Logical Sudoku + Bonus 250 Labyrinth Number Games

- 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 Pitenk