Stimulate your brain with this Experienced Puzzler Hard 16 x 16 Sudoku Puzzle Book. Become a Sudoku Pro by solving all 55 puzzles in this book. Be careful - Sudoku Books can be addictive. With 55 puzzles included in this book, you will be stimulating your brain for a long time helping to keep you mentally sharp and smart!Great pocket size 6" x 9" means it's the perfect size for carrying in your purse, pocket, or backpack. Work your brain anytime, anywhere!Quick Creative's Version of Extreme Sudoku Puzzle Book 55 HARD 16 x 16 Puzzles includes: 55 Hard Sudoku 16 x 16 puzzlesAnswer PagesHours of FunSolution PagesLarger PrintOne Puzzle Per PageSearch the author name above for more extreme Sudoku Versions from Easy to Extra Hard and 9x9 or 16x16