- 250 best puzzles + surprise in 250 jigsaw killer sudoku very hard (need to download and print)- Sudoku 9x9. The entire playing field consists of 81 cells. It is required to fill empty cells with numbers from 1 to 9. Numbers from 1 to 9 are not repeated in the columns and rows of the square 9 x 9. The puzzle contains areas in an arbitrary form. They can be called figurative or geometric, they also have names ("Jigsaw Sudoku," "Geometry Sudo¬ku," "Irregular Sudoku," "Kikagaku Nanpure").- 250 Very hard levels- 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