- You are right about notes. Fixed that in the post 👍
- Secrets here are rooms separated from the rest of the dungeon by a "half-wall". They are not rare and here is a link to map with one: https://watabou.github.io/one-page-dungeon/?seed=76374756 (a small room close to the entrance). Please note, that "secrets visibility" is a persistent setting, so if you switched it off (e.g. accidentally) secret rooms won't be shown on any maps even after reloading the generator - check "View > Secret rooms" in the context menu.