pStimulate your brain with this Extremely Hard 16 x 16 Sudoku Puzzle Book. Become a Sudoku Pro by solving all 50 puzzles in this book. Be careful - Sudoku Books can be addictive. With 50 puzzles included in this book, you will be stimulating your brain for a long time helping to keep you mentally sharp and smart ppGreat pocket size 6 x 9 means it's the perfect size for carrying in your purse, pocket, or backpack. Work your brain anytime, anywhere ppQuick Creative's Version of Extreme Sudoku Puzzle Book 50 HARD 16 x 16 Puzzles includes pulli50 Hard Sudoku 16 x 16 puzzlesliliAnswer PagesliliHours of FunliulpSearch the author name above for more extreme Sudoku Versions from Easy to Extra Hard and 9x9 or 16x16ppbrp