100 Sudoku Puzzle Books For Adults: Your brain will thank you! Would you like to increase the effectiveness of your brain while you have fun? Increase the effectiveness of your brain function with Sudoku puzzles. What if you could reduce your chances of Dementia or Alzheimer's disease by solving Sudoku puzzles? Enjoy the most popular puzzle game in the world! whether you want to keep your brain young and active, develop logical thinking or just keep yourself busy to avoid boredom. Features: 100 Sudoku Puzzles and Solutions. 28 Easy,24 Medium,24 Hard,24 Very Hard Level Puzzle 1 Puzzle per page 5 x 11 (inches) 21.59cm x 27.94cm Perfect as a gift for sudoku