Edit I was mistaken about the links being bad in the mp3 challenge. It wasn't playing well with Centos but seems to be fine on Windows. As such, there are no grounds for closing that challenge. The Rubik's Revenge challenge is currently on hold.
- They are both highly upvoted (+16 and +30)
- Were someone to answer, the answer could not be scored (rubik's lacks test cases, beats has bad file links)
- Both posts are 2+ years old
- Both OP's have not been active on PPCG for ~2 years.
As it stands, I think it is relatively clear that since they cannot be scored, they effectively fall into the "lack objective winning criteria" category and as such are off-topic.
The recourse would then be put them on hold and since the OP's do not seem to be involved, it would be up to the community to edit them.
My actuall questions are specific to each of the posts:
- For the Rubik's Revenge post, if the scoring criteria is left the way it is, test cases are needed. However, to generate test cases, it is likely that someone would need to first actually write an answer (or go through most of the steps for writing an answer.) It seems to me that this would then kind of invalidate the answer of that poster, because he'd be generating test cases and then running his own answer around this. Is there any way around this short of changing the winning criteria for the challenge?
- For the mp3 Beats post, there are some comments that indicate the challenge might be improved by removing the requirement that files be .mp3. If the challenge were closed (or even if it isn't) would it be acceptable for me to post almost the same challenge, with the filetype restriction removed?