How I Use It
I gave the app to my children after showing them the first screen. My 8 year old finished the first app over the span of a couple of weeks. He's now working on the 12+ app.
This is a fantastic conceptual algebra learning app. http://www.atlaseducational.org/atlas-ed-reviews--dragonbox-5-.html has more details. Algebra skills increase gradually building on conceptual learnings and extending to more complex algebraic concepts. It's a wonderful "at your own pace" self-learning tool that has practical implications.