Where's Waldo? is a series of illustrated hidden object gamebooks by British author and illustrator, Martin Handford. Martin Handford's gambebooks pioneered the popular casual game genre, hidden object games. Wally, the official British name is localized as Waldo (North American), Charlie (German), Holger (Danish) and differently in numerous other languages.
The Where's Waldo? in Hollywood book and the app both have adjustable difficulty levels. At the easiest difficulty you look for Waldo in his bright red striped shirt and bobble hat. If you want to challenge yourself, you can look for his friends, other characters, or small objects. The game is challenging because Waldo is surrounded by hundreds of colorful characters who are in comical situations. The digital port is superior to the book because it offers competitive play, light animation, and a hint system. In Where's Waldo? in Hollywood, Waldo travels to different big-budget film sets where hundreds of fans, actors, and crew members are crowding in elbow-to-elbow fashion.
If you don't have an iOS device, the older 2009 title by Ludia, Where's Waldo? The Fantastic Journey is available for Mac, Wii, Win, DS, iOS and as a book.
Interesting trivia: Where's Waldo? (1987), the first Waldo book, is #87 on the "100 Most Frequently Challenged Books" by American Library Association's for the years 1990-1999. There is a wardrobe malfunction scene at the beach. The wardrobe malfunction since has been rectified in the reprints and copies are in your local libraries.