A series of popular, traditional tales written in a simple way for children who are learning to read. LEVEL 4: longer stories for more fluent readers. The Pied Piper of hamelin, Peter and the Wolf, Heidi, The Wizard of Oz, Snow White and the Seven Dwarfs Dick Whittington.A series of popular, traditional tales written in a simple way for children who are learning to read. LEVEL 4: longer stories for more fluent readers. The Pied Piper of hamelin, Peter and the Wolf, Heidi, The Wizard of Oz, Snow White and the Seven Dwarfs Dick Whittington.