400 classic Killer sudoku 9 x 9 MEDIUM - HARD + BONUS 250 Hidoku puzzles: Sudoku with Medium, Hard levels puzzles and a Hidoku 9 x 9 very hard levels

400 amusing killer classic puzzles 9 x 9 + bonus in 250 Hidoku 9 x 9 very difficult levels (bonus puzzles need to be downloaded and printed). The way to mastery of Sudoku! 400 unique Sudoku puzzles. Fitness for your brain. Original Sudoku for the power of your brain. Just tested puzzles. Answers at the end of the book. Good mind support in the excellent form. Develops memory, logical thinking, helps to focus. Creative possibilities expand. Ideal gift for all fans of puzzles. Killer sudoku m...