Okay, so normally you can purchase Evolver for about $20 which is typical for an online game.

Google Shopping Search

But that is for missions "1-5" and the download is for all 20 missions. That makes a little more sense from a pricing perspective.

There was one page on their website that broke down the topics (it was really good and of course I can't find it now). I was impressed at the material covered. We'll likely purchase it this week. If I can figure out how to get back to that list of material covered, I'll post.

JB