400 Chain Hard Classic Puzzles 9 X 9 + Bonus 250 Veteran Sudoku: Holmes Is a Perfectly Compiled Sudoku Book. Master of Puzzles Chain Sudoku. Hard Puzz

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 puzzles. A great book for free time and studying the mind. I hope you enjoy the book. Best regards, Basford Holmes