Reading Level (RL3). Perfect Chapter book for Early Readers and those who like a little adventure. Try surviving the science fair from the Black Lagoon! Everyone has to invent something for the science fair, but you'd rather invent a way to get out of it! You're trying to decide between cloning yourself or building a laugh machine, but you'd better figure out something soon because Mrs. Green might fail you! My 1st grader loved this book because it was a break from regular chapter books...full of fun illustrations.