You could simply merge two not-widely-known LeetCode or Advent of Code problems and add a bit of a funny story to it, and it would be hundreds of times better than the current 4th challenge.
While I might not consider myself a SE community member, but rather a passerby.
I like fun challenges! I was hyped to see fun challenges appearing on this website! I had fun doing Challenge 3 (I didn't notice them during Challenges 1 and 2). Despite that, I join all the negative feedback the series has gotten so far. And I am not interested in joining further with Challenge 4, due to its vagueness. As, and I personally find it not fun...
Although the idea of challenges appeals to me as a whole.