finding secret rooms
- a room touching 3 other rooms, with no obstacles on the walls (like rocks, spikes, gaps, etc)
- a room touching 2 other rooms
- this is even a possibility for "2 rooms": https://i.imgur.com/qQnG3hu.png (cursor is pointing)
- cannot border a boss room
NOTE: a small (thinner) room doesn't count as touching: https://i.imgur.com/XN1qn1d.png
NOTE: can technically touch 4 rooms