This world is about an experience I had at worlds in 2017 or 2018.
At that time I entered like any other user to explore the rooms of this 3D chat and decided to follow a person with a peculiar name. I followed him through several rooms and he would only tell me to stop following him or I would get in trouble, but since curiosity killed the cat, I kept following him.
I ended up in a black room next to him, and one of the things he said to me before he left was: Welcome To House.
He then sent me a link to YouTube and closed Worlds.
When I left the black room I found some Chinese looking stuff and then another room that looked like a spaceship which I could never find. I could say for sure that these rooms were part of Polymatrix, but I can't find those rooms.

The NF8io room belongs to Polymatrix.