Penguin Readers is a series of simplified novels, film novelizations and original titles that introduce students at all levels to the pleasures of reading in English. Originally designed for teaching English as a foreign language, the series' combination of high interest level and low reading age makes it suitable for both English-speaking teenagers with limited reading skills and students of English as a second language. Many titles in the series also provide access to the pre-20th century literature strands of the National Curriculum English Orders. Penguin Readers are graded at seven levels of difficulty, from Easystarts with a 200-word vocabulary, to Level 6 (Advanced) with a 3000-word vocabulary. In addition, titles fall into one of three sub-categories: Contemporary, Classics or Originals. At the end of each book there is a section of enjoyable exercises focusing on vocabulary building, comprehension, discussion and writing. Some titles in the series are available with an accompanying audio cassette, or in a book and cassette pack.