First Words with Peppais alevelled reading seriesofPeppa Pig storiesfor children who are learning to read. The series is based on theDolch Sight Words list; a list of the 220 most common words found in children's English-language reading material.Peppa and her friends love playing in Peppa's treehouse. Then, Grandpa Pig makes a new den with a door that goes up and down. Which den will they play in now?