Improve your brain health with fun and interesting Sudoku puzzles!★ This book includes 100 classic Sudoku puzzles★ The puzzles are HARD★ Sudoku grids are large, easy to read, and simple to fill out★ Check your work with the answer key at the back of the book We guarantee that Our Sudoku: ✅ Helps you practicing your logical thinking✅ Improves your number skills✅ Reduces the chances of developing Alzheimer's✅ Makes you learn to do things quickly✅ Increase your sense of time Looking for some gift ideas?Either Birthday, Valentine's Day, Christmas, Mother's or Father's Day, this Sudoku Book is an ideal gift.