Challenge your mind and improve your memory- craving mental stimulation, trying to prevent brain fog or just looking for an enjoyable way to expand your knowledge? Boost your brainpower and have a ton of fun! With 90 days of crossword puzzles that progress from easy to hard. And with bonus crosswords to keep your good habit going, you’ll be amazed by the improvement in your memory, focus and mental dexterity in just three short months.