Seriously hard crossword puzzles: 100 challenging puzzles

Exercise your mind with the ultimate collection of brain gamesKeeping your brain healthy is just as important as taking care of your body. While all puzzles are great for brain health, different kinds of puzzles strengthen different mental skills.Any good workout makes you stronger over time, and the puzzles in this book are no exception. Unlike other puzzle books for adults, these puzzles progress through four different challenge levels, so you can watch your puzzling skills improve while strengthening your mind.- 100 of the most difficult puzzles from the Times- Puzzles edited by crossword legend Will Shortz- Convenient portable paperback size for on-the-go solving