Level 16 right.
To be honest, I didn't know that you can avoid headhunters by crawling, discovering this was a real gamechanger.
Nevertheless, I think it would be quite nice to put a hint somewhere for the riddle. Maybe a stone in some room with a text. Something like that. I took me 10 Minutes to do the riddle by just pulling levers and avoiding the headhunter.
But I really, really like the new animation with the zombie variant!