Just spent almost 3 hours on this mission, 80% of the time trying to understand the ad-hoc logic and tasks. There is really no need in such case studies, as there is very little transferable skills in learning so much about 10000 different ways to simulate an application processing time. Really. I wish I learned more about stacks, queues and the threading in these 3 hours.
PS. Yes, I searched in the “optional tag” window and tried to add tag:172. It doesn’t stick.