HarperCollins (February 5, 2013)
review copy from the public library I love this book because of the simplicity of it. I really recommend this for read-alouds and early readers.
This book is about three of the monsters, which are primary colors making the rest of the monsters (there are four) secondary colors. There is one monster left, and there no more options left so…. The last Monster was RAINBOW! --N