Level 2 Ready-to-Read What's wrong with Henry's new tree house? In Henry and Mudge's twenty-first adventure, Henry's Uncle Jake has built him a tree house. Henry loves tree houses, but Mudge can't climb trees. What fun is a tree house if you can't share it with your best friend? Ready-to-Read books offer children a world of possibilities at four different reading levels: Pre-Level 1 Recognizing Words * Word repetition * Familiar words and phrases * Simple sentences Level 1 Starting to Read * Simple stories * Increased vocabulary * Longer sentences Level 2 Reading Independently * More-complex stories * Varied sentence structure * Paragraphs and short chapters Level 3 Reading Proficiently * Rich vocabulary * More-challenging stories * Longer chapters.