Using this magic water doodle book is super easy. First, fill the pen with water. Then, gently brush the tip of the pen over the paper in the book. As you do, the hidden colorful dinosaur scene will start to show up. This book is great for travel, so you can take it with you on trips. It's designed for kids 3 years old and older. Remember to keep the pen away from small children who might put it in their mouths. After use, store the book in a dry place to keep it in good condition. Have fun discovering all the colorful dinosaurs in the Dino World!