Publisher's Synopsis
The way to mastery of Sudoku! Sudoku consists of a chain of circles. Figures are arranged in circles in such a way that horizontally and vertically all numbers are different. In the links of one chain, the numbers should not be repeated. - 200 Professional (Hard levels) - 200 Veteran (Very hard levels) + bonus in 250 classics very hard Sudoku 9 x 9 (bonus puzzles need to be downloaded and printed) - only 1 verified solution - all answers are at the end of the book - only original puzzles. A great book for free time and studying the mind. I hope you enjoy the book.Best regards, Basford Holmes
