1000 sudoku puzzles for adultsA brain game like sudoku, as well as crossword puzzles, taking classes, reading, and writing, can help delay dementia and Alzheimer's disease and protect the brain from decline. ... And, says Snyder, while it offers good exercise and stimulation for the brain, sudoku can actually be very relaxing.Features: Lots of puzzles: Contains 1000 Sudoku puzzles (100 very easy, 100 easy, 100 medium, 200 hard, 200 difficult, 300 Insane). Suitable for all Levels : Beginner To