Duolingo Is Not Built for Ultra Learning

The surface level of the ap is like a knowledge tree that you work your way from top to bottom. It gets progressively harder, and there's built in check points. When you get to level four, you're hearing the words being spoken in english or spanish, and then you're typing out the sentence. So i don't really think that's fair. My opinion on this is that duolingo is not built for ultra learning, and that's the way i like itha.