Heart Word Builders are a set of the most common Heart Words (or tricky words) presented on activity cards with the tricky part highlighted. Build each Heart Word with Phonics Blox using the pink color-coding to identify the trick part of the word. Innovative speech bubbles provide a clue to the sound the tricky part makes. Follows a systematic progression across the Phases 2-4 of Rainbow Phonics. Includes 30 blocks and 32 activity cards.