400 classic Killer sudoku 9 x 9 HARD - VERY HARD + BONUS 250 Hidoku puzzles: Sudoku with Hard, Very 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! Fitness for your brain. Original Sudoku for the power of your brain. Just tested puzzles. Answers at the end of the book. Killer sudoku may be called or searched with the following phrases or names: sudoku, sum sudoku, killer sudoku books, times killer sudoku, sumdoku, sudoku books, extreme killer sudoku, times killer su...