I enjoyed doing the puzzle. I'm not a DBA per-say and so it was fun to see how many I could get on my own and how many answers I could get with additional research. I was happy at how many I could get on my own. However, even with lots of research, I still couldn't get all the answers.
To keep the puzzle fun and the level of question about where it is, I would not do it too often. Maybe once a quarter or even twice a year. Just my 2 cents.
Also, if I get one answer wrong and realize it after getting another answer in the puzzle, I need to be able to erase the first answer. It wasn't clear how to do that. I think the above postings tried to address that issue by saying to put in spaces, but I'm not sure I understood the above postings.
That's my feedback.