Description The zorbs on the Planet of Hair have ear infections. It is up to Buzz, Hal, Finn, and Nova to help them find the cure. But what will the cure be? The phonemes /ear/air/ure/ are featured in this title. In Level 4 - Blue books, children build on the letter-sound combinations learned in levels 1 and 2. They learn consonant digraphs (sounds made up of two letters together such as 'ch' or "ll") and long vowel sounds (such as 'igh' or 'ai').