The FC Basement (short for Famicom) is an area accessible from the Tribe Settlement.
Features
This area is a collection of staircases with maroon floors (that silence your footstep noises) and 8-bit music playing in the background. There are also a collection of various monsters inhabiting the different floors.
If you keep climbing various staircases, you may come across one of them which leads to a monochrome area. Continuing up these stairs will take you to Monochrome Feudal Japan.
Trivia
The star in the entry area, if interacted with, makes a noise classic gamers may find familiar...