Look at that little hamster in a cage, and the other animals, too—a bunny, a squirrel, a bird, a frog, and even a porcupine. All of these little animals want to play outside! Luckily, you, the reader, are in charge of the keys and have only to open the cages to make these critters happy. But wait—what’s in that box that you’re not supposed to touch? Uh-oh.