Levels 5-7 through 5-12 work on a variety of more challenging vowel pairs. Level 5-7 shows students that the 'ow' combo can make a long 'o' sound (as in words like slow, know, and grow) in addition to the 'ou' sound it made in level 5-6.

Level 5-8 compares 'au' and 'aw', and the same logic that applied to levels 5-4, 5-5, and 5-6 applies here: The general rule of thumb for deciding whether to use au or aw in a word is that in the middle of a syllable, you should generally use au; to close a syllable or end a word, use aw.

Level 5-9 forces students to choose between three different vowel combinations that make the same or a very similar sound: ew, ue, and oo.

Level 5-10 focuses on the 'oa' vowel pair that is usually particularly difficult for students.

Levels 5-11 and 5-12 are review levels conceptually, but they include new high-frequency words that hadn't already been included. This provides students with a great chance to review the various vowel pairs and also the consonant blends they had worked on in planets 2 and 3.