Most of my 4th and 5th graders are very familiar with my library book hunts. Teams receive a clue about a book. Examples of the types of clues I've used include book titles written in ciphers or riddles to solve. Teams use the clues to identify a specific book title, which they then search for on the Alexandria library catalog. If they have solved the clue correctly, they should then locate a book in the library with that title and, in the back of that book, they'll find another clue to a second book to locate. At the end of the book hunt, which typically involves each team locating 2 or 3 books, the final book will usually have bookmarks for each team member!
Yesterday, Ms. Corrow's class did a book hunt that required them to first look up information using the Britannica Online Encyclopedia. For each book they had to locate, they were given two clues to solve. If both clues were solved correctly, they would then have two words to type into Alexandria which would lead them to a particular book in the library. All the teams did a great job using Britannica Online and finding the correct books!