'Picture Puzzle' book has four levels; novice, master, expert, and genius. This is the first of what 'LIFE' hopes will be many Picture puzzle books. This isn't a collection of previously published brainteasers - none of the 90 puzzles contained between in this book have appeared elsewhere. Devoted puzzlers, renowned for their sharp eyes, will recognise some photos that have been previously published in 'LIFE'. These have been reworked with all-new clues. They'll also notice that some pictures repeat two or three times within the book, in slightly different forms. Each is a distinct puzzle, with its own set of alterations to spot.