IMPORTANT - EBOOK edition of this book is an PRINT BOOK REPLICA and not used for completing puzzles on the device. The eBook is a preview providing useful content on the benefits of crossword, sudoku and other puzzles for both children and adults, also showing the actual puzzles available in the physical copy of the book. A BONUS link in the book lets you download books with high quality crossword puzzle and sudoku book PDF pages with dozens of puzzles with clues and answers that readers can PRINT. The download is optional, it is not the main function or purpose of this ebook - PRINT REPLICA. If it's logic you want boosted, a book of crossword puzzles will do you good. A book of crossword puzzles contains interesting facts on a wide range of topics including math, science, geography, and history and so on. You will find that absorption of new information is made much more efficient because it's been broken down into details. Go ahead and secure your copy of this book today!