- 250 exciting, exciting puzzles - 50 "X" Diagonal + 50 Anti-Knight + 50 Hermit (Anti king) + 50 Anti-Diagonal + 50 Windowdoku.- hard and believe the hard version as a champion, the golden prize of extreme Sudoku - each Sudoku has a unique solution - tasks are conveniently located - large font - develops memory, logical thinking, helps to focus - 2 puzzles on the page - wide internal fields allow you to record your decisions and thoughts- very convenient and practical - expands creative possibilities - perfect gift for all fans of puzzles. Sudoku 16x16, separated by smaller rectangles of 4x4 cells. It is necessary to fill empty cells with numbers from 1 to 16, each of the digits should appear only once in each line of the 16x16 square, 16x16 column, and 4x4 rectangle. An excellent book for free time pastime and mind training. Presented 150 pages. The format is 8.5 '' x 11 ''. I hope you enjoy my book. This Sudoku will provide you with rest, color your leisure time, transform your free time into relaxation, give rest from every day to your mind, add zest, develop memory, develop logical thinking and concentration of attention. I would also be very grateful if you could write a review. Thank you. Best regards, Andrii Pitenko