When registering a room, you provide descriptions for at least 4 doors. Describe each door as it would appear from outside the room.
For example, if the green room is a room pretending to be a bouncy castle,
then the bouncy castle room could declare a description for their 'east'
door so person walking east would see the following when listing
(E)ast An inflated doorway, through which you can seemingly hear much laughter, and merriment
If this doesn’t make sense to you, don’t worry about it; describe each door without referencing a direction, and things will be fine.