Penguin Readers - A series of simplified novels, film novelizations and original titles that have been written for learners of English as a second language.

Level 1 - beginner (approx 300 words) | Level 2 - elementary (500 words)
Level 3 - pre-intermediate | Level 4 - intermediate ( 1650 words)
Level 5 - upper intermediate (2300 words) | Level 6 - advanced (3000 words)

The series is designed to be suitable for students of English as a foreign language (EFL), for students of English as a second language (ESL) and for reluctant readers. They are graded at six levels of difficulty.