Jolly Phonics readers come in 4 different levels, with 18 books per level. Each level includes fiction and non fiction titles as well as colourful illustrations. Level 1 starts with one short sentence per page and by Level 4, there are approximately 4 sentences per page. Level 1 is equivalent to approximately RR Levels 1 to 5, Level 2 approximately RR Levels 6 to 8, Level 3 approximately RR Levels 9-14 and Level 4 approximately RR Levels 15-18.