A proper Listener, this. Apropos the plea at the beginning of the thread, I have been thinking for a while that explicit answers would be best encoded in a Caesar cipher. Anyone capable of finishing a Listener is more than capable of decoding one, even without knowing the shift, with one of the many online tools available, e.g. pressing Auto Solve on this one.
https://www.boxentriq.com/code-breaking/caesar-cipher
I imagine only savants would be able to see the answers at a glance, and it would ensure the fun is not spoiled for those who start late, or only come here for hints rather than full solutions. I'll get my coat . . .