Real Sudoku - Classic Killer Puzzles 12 X 12 Hard + Bonus

- 250 amusing 12x12 killer puzzles + surprise in 250 Classic Sudoku "X" Diagonal - 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 Pitenk