Sudoku puzzles are a fun challenge - and a great way for seniors to stay sharp and preserve their reasoning ability and logical thinking skills. This book presents 300 Sudoku puzzles that vary widely in their level of difficulty: Puzzles 1 - 75 are 4 x 4 Puzzles 75 - 150 are 6 x 6 Puzzles 151 - 225 are 8 x 8 Puzzles 226 - 300 are 9 x 9 This book is custom made for seniors; it has large print, plenty of room for scratch work on every page, and a wide range of problems, from super easy to downright challenging. Readers can start at the level that works best for them and gradually build their skills. By doing so, they will develop the focus and patience they need to become true Sudoku masters. Most importantly, they will keep their brains young by pursuing an activity that requires them to think clearly, pay meticulous attention to detail, and make good decisions in a situation that constantly changes. What better way to stay sharp and age graciously?.