Solving a riddle to get into advanced options, however easy to solve or
circumvent by brute force, is really unprofessional. You should consider that
some people are in a rush to get things done and when you want to quickly
change an option only to find you have to read a stupid riddle to get what you
want is infuriating.
On a side note, many things in "advanced options" should be included in the
main options, like paranthesis autocomplete and text wrapping.
I don't think the riddle is not there anymore, in version 2.4. Perhaps you
refer to an older version of texstudio