Hard Sudoku Puzzles for AdultsPlaying Sudoku is full of fun. The good feeling that a person gets each time they effectively solve a puzzle can become quite addictive, especially when he/she is feeling depressed or anxious. The more they play, the better they feel.In this book, we've included 100 hard Sudoku puzzles.We've tried our best to put together a book that is easy to read with minimal pieces of paper required. Because of the wide inner margin, you can easily rip the pages to play if you want it that way. With the unique glossy book cover, this book can be a great gift for family members, friends, or co-workers who love playing Sudoku.Add to cart now!