Using this Water Wow Pet Mazes coloring book is a breeze. First, fill the chunky water pen with water. Then, start coloring the scenes on the reusable pages. As you draw with the pen, the hidden colors will appear. When you're done, let the page dry, and the colors will disappear, so you can color it again. The pen is easy to refill and hold, and it stores neatly in the front cover. When traveling, just throw the compact, spiral - bound book in your bag. Remember not to use anything other than water to fill the pen. Keep the book away from excessive heat or moisture to preserve the quality of the reusable pages. If the pen gets clogged, you can try rinsing it with clean water. Have fun with this no - mess coloring adventure!