This is the Third and Final Volume of a series of Three (3) volumes of Pocket Sudoku Hard Puzzle books. Looking to challenge yourself after completing the Medium Sudoku Books? Now you can take on the next installment of Hard Sudoku Puzzle books. They are easy to carry with you while on vacation, traveling to work or school or just lounging around the house, the pool, or the park. If you are looking for a fun way to sharpen your memory and improve your critical thinking skills, then this Pocket Sudoku Hard book is for you. While you may be a beginner or a seasoned sudoku player, this book offers you endless entertainment with hundreds of puzzles to choose from. Primarily these Hard level puzzles allow you plenty of practice to improve cognitive skills. Comprehensive solution guides: No need to worry if you get stuck on a puzzle. With our solution guide it's easy to follow; making this an ideal option for those looking to refine their Sudoku skills. All our puzzle books come with the solution at the back of the book in case you want to check your work. Ideal Gift: This sudoku book would be a great gift for someone who wants to relax and unwind while enhancing their mind effortlessly. Remember to get the other books in the series or any of the other Puzzle Activity Books I have published.