Illusory Dark Labyrinth

Illusory Dark Labyrinth is an area in B3313.

Description
A dark, fog-filled labyrinth designed to mirror the AI Headquarters in it's darkness and the illusive nature of it's end goal. In a single room lies the Core. However, instead of being a trap in lieu in the aforementioned level, the true Core is contained within. Fast Travel is unavailable here.

Origins
This area appears to be original creation.

Music that plays here is "Haunted House" from vanilla game OST.

Reading the signs:
WARNING! IF YOU ARE PRONE TO SEIZURES

THERE IS A CHANCE YOU MAY ENCOUNTER

AN UNFINISHED AREA WHEN TESTING, IF YOU SEE

ANY AREAS WITH AN EXPERIMENTAL LOGO, OR

A MARIO ICON WITH AN EXCLAIMATION POINT, PLEASE

EXIT LEVEL IF YOU ARE AT RISK, AND IMMEDIATELY

REPORT TO THE HEAD OF QA.

THANK YOU FOR YOUR COOPERATION!

Plot meaning
It is likely that this place was intended for AI tests. But suddenly something went wrong there and this place suddenly became gloomy, dark and quite dangerous.

Leading here

 * Personalization Chamber: With some random chance, the painting can send the player here.
 * Flesh Mountain: Enter the hole at the top of the mountain.