[EricMacKinnon]

Thank you so much for the excellent feedback!

You've definitely encountered some (fortunately non-crashing) bugs here that I need to look at and fix (the 22 versus 22 for instance needs to have different numbers to make sense in a lesson on operand-order equivalence for multiplication), but seems like there are also quite a few product/design tweaks I should make as well.

For the lessons jumping around --> that's actually intentional & very important for learning (though from your feedback I can see I really need to make it much clearer why so that learners don't experience it as aimless) - question-variation achieves 2 things - it pushes what the learned just covered out of they working memory (so that when they get the question again in a few moments, they need to fully reconstruct the idea in their minds), while at the same time having the learner review lessons they've learned recently (for new users, however, since I don't have any recent lessons for them yet, I'm including questions thy've likely already mastered given their level, which may need to rethink as it could be adding to that potential of aimlessness learners might have).

Thanks again, and definitely let me know if you encounter any other issues.