We’re super excited to announce a new feature that we believe finally lets us teach better. We are adding a new dimension to your skill trees, which we call Skill Levels! Each skill you do will have a level associated with it (not related to your XP level). As you level up a skill, the types of exercises you see will get harder (harder sentences, more typing in the language you’re learning, etc.). You’ll also need to practice more and more to get to the next level.
(read full Crown Skills announcement in this forum post)