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.- 400 Professional (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 puzzlesA great book for free time and studying the mind.I hope you enjoy the book.Best regards, Basford Holmes
