"Do they enjoy playing games?"
I tried wording this "他们喜欢玩游戏吗？" and it was marked wrong. Is there something I don't understand about when you need to use the 吗? question structure vs. when you need to use the (verb)不(verb) sentence structure? I thought they were more or less both always valid?
Is this an oversight or is there a good reason why I was marked wrong?
No, your understanding of 吗 and verb+不+verb questions is correct, both should be valid answers. It's an oversight. Just report it and don't worry, your sentence is correct. :) As far as I know this is still in beta, so things like this tend to happen.
Makes sense. It's frustrating though that it's been over a week (12/25/17 today) and it's still not accepted.
I understand that the team has limited resources, but if they don't have the resources to keep up in a timely manner, why did they launch the course to the public?
A limited / private release alpha could have allowed them to control the number of users testing the course, so that they could have stayed on top of reports.
This level of dysfunctionality and poor responsiveness to reports is not necessary, it's a question of bad management, unnecessarily bad choices being made.
NONE of my reports of missing or wrong hover-over hints have been corrected either and many of them have been over a month now. This level of incompetence and dysfunctionality really rubs me the wrong way...I had been a paying subscriber and I cancelled my subscription recently, and this was a factor in it.
The hover-over hints don't give "玩", yet this is what the exercise wants.
This is very frustrating and makes the exercise hard to complete.
I have been told it is common to use 他们 over 她们 when gender is unspecified.
One would only notice a difference in writing since both 他 and 她 are spoken as Tā