OK, as requested...
...a tutorial about Circles with Grandma was added to the book. At 32 pages, it's the biggest chapter in the book by far. It covers a lot of ground though.
Since it's such a big part of the book, I figured that I'd update the game. The idea was to make it a universal purchase. That should only take me a couple of hours — right?!
I started around 7:30 am... skipped breakfast... just worked for four hours straight. I still wasn't done. I tried again in the afternoon. Another couple of hours later, the updates are finally in review. Screenshots problems, notch problems, Xcode build issues, browser issues, sound issues... iOS 13 - WkWebView BUG: audio stop… | Apple Developer Forums ...JavaScript issues, settings/preferences issues — and this was supposed to be an "easy" project.
That's why it's such a great lesson in web and app development!
...but I think if I had to do this again, it wouldn't be on the App Store. It would be made of wood, the circles would be ball bearings, and the game would sold on Etsy.