Tons of Sudoku for Adults & Seniors

Completing Sudoku regularly helps the brain process both problem solving and improves logical thought process with the use of deductive reasoning, which can also be applied to approaching real life challenges in a different manner.
Playing Sudoku on a daily basis helps to keep an active mind and players often see improvements in their overall concentration.
This Sudoku book is packed with the following features:
- 1000 Sudoku Puzzles in 3 Difficulty Levels: 333 Hard, 334 Very Hard, 333 Extreme.
- Answers to every puzzle are provided.
- Each puzzle is guaranteed to have only one solution.
- Six puzzles per page (8.5 x 11 inches).
- Includes free bonus puzzles you can download book (Fitness for your brain: Word Search With Hidden Message: Train your brain anywhere, anytime! - 102 Puzzles for Adults and Seniors).