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Description
Tesseract, as its name suggests, takes the appearance of the four-dimensional semi-transparent cube with a dark rippling surface, that ripples with fractal figures. Tesseract is “located” in the Blue Channel, like the majority of other levels — it can be observed from the outside of its domain, though it has no “skybox”. It has no set location -– one must drift in the channel’s void in any direction, with any route, inevitably encountering Tesseract if they meet the requirment. The only requirment is to keeps the initial desire to drift outside of the Blue Channel, deeper into the Backrooms. Thus, one must ignore any other level that may be encountered during this journey. Intent is a key factor in this task, Tesseract can not be found randomly. It is important to note that one's desire to leave the Backrooms may prohibit them from ever finding this level.
Exterior of the Tesseract.
It is impossible to visually estimate its ever-changing size from the outside, as it looks bigger from a distance and smaller after coming closer. Within the Tesseract, one will find nothing but the outer layer of the cube and a smaller copy of the same structure at the center of the structure. The free space within the level is estimated to be at least 16 cubic meters, while the inner "cube" is also able to change its form, being 4 cubic meters on average when it is static. The inner cube's form rapidly changes when someone is inside Tesseract, converting in and out of itself, so naming it "cube" is a stretch. The inner structure appears to be made of tinted glass. Its durability is currently unknown, though the current hypothesis suggests it is indestructible due to it not being a traditional physical object.
Fourth dimension
The Tesseract is presumably able to warp the fourth dimension — time within the Backrooms — in relation to the wanderer inside the cube, displaying events from their past within the inner cubical structure, mostly key moments from their life. All the events that are shown by Tesseract's visions immediately get recognized by the person trapped within it, but it is unclear if what Tesseract shows is the actual past of the wanderer within it and not a set of simulated scenarios that wander is able to recognise due to Tesseract’s influence, akin to the fake feeling of nostalgia for things that never happened and places one has never visited.
Pale, monochrome visions of the past often picture the most grim and dire events of wanderer’s life, commonly moments of danger, where one can see how miraculous their survival truly was at a time. Some visions are different, far less comforting – they fill one’s heart with pure terror. Visions of stalking entities that will inevitably capture the wanderer. Seeing this, people, trapped within the Tesseract, inevitably start to scream to their past selves right through the transparent walls of the cube in an attempt to warn, to make them turn around and see what creeps behind. And they do just that. As if being able to hear the scream through time itself they turn back, avoiding danger. They notice the threat beforehand, and they flee to safety.
Tesseract's visions
Maybe once or twice everyone heard it on their own: unrecognisable voice behind us, spontaneous shivers down the spine, feeling of unavoidable dread lying ahead. Maybe it really happened to us.
But said visions never end, only growing in number, leaving anxious wanderers to endlessly try their best, to keep their past self alive and safe in a never ending spiral of terrifying pictures of the past.
One needs no water, no food, not even sleep to survive – their body is but a static image, the last instance of their physical form within the Backrooms, unable to change further, locked away from the future, with no means to end the torture at this moment. Wanderers, trapped within the Tesseract, can neither die nor even experience any kind of physical injury, no harm can be done to their bodies.
There is no time within the Tesseract, time itself is just another axis for it to move through, entire lifetimes ahead that loop forever before one’s gaze. Only a withered and tortured mind can throw away self-preservation in a radical attempt to escape the Tesseract.
The only documented successful way of leaving this level is achieved by an act of deliberate ignorance towards Tesseract's visions: one must not interfere in events that Tesseract displays, allowing their past self to die in whichever way Tesseract shows without wanderer's involvment. After the past self their vision is dead, an exhausted wanderer will appear on the Level 0, and all the information, all proofs of one’s existence in the Backrooms’ history will be forever erased, as if they’ve truly died at that moment, as if they were never a part of this reality, as if they've never reach Tesseract in the first place.
Deep Blue
M.E.G.’s operation “Deep Blue” is a failed attempt to find a path to leave Daedos’ crust, therefore entering its deeper layers, via exploration of the Blue Channel. During January of 2018 special squad of M.E.G. veterans and volunteers with a high level access to the secret information was sent on a journey to enter Blue Channel and roam within its void, recording their trip not only with audio and video devices but also with a unique prototype, created by Backrooms Robotics, a device that is capable of “recording” its wielder’s memories into a set of empty memory jars.
The Deep Blue squad was attacked by a group of entities, thus the initial group got separated into 2 parts of 9 and 7 individuals – the decision was made to continue the mission after regrouping on the Level 522. Among 16 members of the Deep Blue squad only 2 were able to reach Tesseract in the void, after which operative M. Perceval entered its domain. Volunteer C. Hance left the Blue Channel and was heading towards the nearest outpost. Luckily, his remains were located on the Level 38 together with the image of the Tesseract.
M. Perceval was fully erased from everyone’s memory, including both digital and physical instances of information about this person: M.E.G. database was missing IDs in its tables, papers had blank spaces, photos and videos no longer featured said individual. Moreover, information about the prototype, that was used to capture and record memories, was lost as well, leaving both M.E.G. and even Backrooms Robotics with no knowledge about its internal structure and the process of creation, thus eliminating years of technical progress in research of anomalous artificial objects based around memory jars.
Wanderer M. Perceval was interrogated on the Level 1 — he claimed that he is a part of M.E.G.'s special task group, reavealing all the major details about the operation that were revealed to operatives. Additionally, he was reffering to the information, existance of which is secured from general members of the group, proofing his status as an M.E.G. veteran. Information, presented in this document above, visualizes memories of the lost operative that was gathered from the prototype. M.E.G. operative has successfully traveled from Level 0 to the Base Alpha together with the device. While there were no records of his existence, the context of the Deep Blue mission remained almost untouched by the Tesseract’s influence. It seems that when something is erased from the reality by Tesseract, all thigs around it, all the stuff that was ever connected to it, even actions of the erased person do not disappear from the Backrooms.
Judging by the context of test logs, there should have been at least one more attempt to send an M.E.G. operative to the Tesseract to test its influence on the person, whose past was already erased.
Mission Deep Blue is marked as a failure.
All missions to leave Daedos’ crust are put on-hold
Entering Tesseract more than once is strictly prohibited.
Ex-operative M. Perceval, after being trapped inside the level, came to a conclusion that Tesseract is something akin to a defensive mechanism of Daedos, an unstoppable force that is able to erase the very root cause of the danger it faces, preventing anyone and anything from ever going past it.
Entrances and Exits
Entrances
Entering Tesseract is possible only via traveling through Blue Channel’s void, ignoring other levels on one’s way, drifting further into the blue abyss with desire to go deepr into the Backrooms, not to leave it behind.
Exits
One must allow themself to be killed in Tesseract’s visions, erasing their existence, all the records about them ever stepping foot on floors of Backrooms' levels, retroactively preventing them from ever entering the Tesseract as well. After performing this paradox one will be brought back to the beginning, to the Level 0 all anew.
It forgives only once. No one was ever able to leave Tesseract twice.


