Welcome to volume 9 of the most popular series of books with Killer Sudoku puzzles - now even more fun Contents: 100 Killer Sudoku 10 Killer Sudoku 9x9 using 0 to 8 10 Killer Sudoku 10x10 using 0 to 930 ZERO Killer Sudoku (blank cages) ...and some bonus puzzles Difficulty levels are COOL-THINKER-BRAIN-IQ. The easiest level (EASY) has been removed A majority of puzzles are THINKER and BRAIN, with lots of IQs, too. Zero Killer Sudoku puzzles are mostly IQs, of course. All puzzles in this book are NEW. Have fun and enjoy