After the initial review was posted, I chatted with Henry Borenson, the publisher of the app, about some of the concerns and have updated the review with some clarifications.
Hands-On Equations is broken out into three different levels. Level 1 costs $4.99 and offers six different lessons. Both Level 2 and Level 3 offers eight lessons and cost $3.99. I initially reviewed the "Lite" version of Level 1, which offers the first three Level 1 lessons free of charge. Whenever I was ready to upgrade to the full version of Level 1, or buy any of the other levels, I could click on the relevant buttons right on the main menu. I received the codes for the full Level 1 app and tried out the other exercises to confirm the user experience was the same for both the free and the paid app.
Each lesson offers a short instructional video and two practice problems, followed by 10 extra exercises. There is no way to jump ahead and just do the problems, because the problems are "locked" with a little lock icon to show that the student can't access that component yet. Users have to watch the video before the practices are unlocked, and the practice problems have to be completed before the exercises are available. Previous versions allowed students to solve exercises without first viewing the videos, but many of them got stuck, so the current versions require students to complete the steps in order.
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