I also support this
Navigating exercises
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In the app, when doing puzzles or exercises under "learn", it is very frustrating to not be able to navigate through the exercises manually. In the "learn" exercises, you cannot return to the previous exercise after completing it. If you needed a hint or did not fully understand the solution, this is unproductive.
A good interface would have all of the exercises or puzzles for each section in a side menu, with an indication of whether you got it right or not. This would ideally allow you to return to them.