highlights hidden pictures 2021 4-book set highlights for children the 2021 collections are now available! the hidden pictures 2021 4-book set is the latest in our annual series and a customer favorite, year after year! each 32-page puzzle book has hundreds of hidden objects to find, for tons of discoveries kids can’t wait to dig into. (we bet you won’t be able to resist doing a few of these seek-and-find games yourself!) the black-and-white puzzles are perfect for coloring after they’ve been solved. plus, searching for objects in hidden pictures scenes builds skills kids use in school, like vocabulary, concentration and attention to detail.