The Official Utterly Addictive Number-Placing Puzzle Will solving these all-new Fiendish Su Doku puzzles scare you speechless while giving you the ultimate challenge? Providing hours of entertainment, Su Doku engages your mind, improves your concentration, and helps you stay mentally fit. With 150 brand-new puzzles to complete, you'll become a Su Doku master in no time! The Official Utterly Addictive Number-Placing Puzzle Will solving these all-new Fiendish Su Doku puzzles scare you speechless while giving you the ultimate challenge? Providing hours of entertainment, Su Doku engages your mind, improves your concentration, and helps you stay mentally fit. With 150 brand-new puzzles to complete, you'll become a Su Doku master in no time! Morrow Gift is a collection of books and paper goods tailor-made by the William Morrow crew at HarperCollins. Here, we celebrate self-care, truth, beauty, and birthdays. Our projects are one-of-a-kind and created for you to enjoy and to share.