Level 667 - "Dometopia"

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A photo of City-α.

Documents regarding the early discovery of Level 667:

SURVIVAL DIFFICULTY:

Class Ψ

Unsafe
Mental Hazard
High Entity Count

Description

Structure Overview

Level 667 is comprised of an unknown amount of gigantic PMMA (Polymethyl Methacrylate) hollow spheres¹ and their contents, as well as a heavy water sea with an extremely high concentration of deuterium and tritium. The level features a 24-hour and equally divided day and night cycle. The climate is pleasant, although thunderstorms and heavy water rain frequently occur.

The PMMA spheres contain a remarkably wide variety of contents, including but not limited to microcities, non-Tokamak² nuclear fusion power plants, abnormally large amusement parks, and wastes. The contents of each sphere are categorised in accordance with their general characteristics as the styles and specific impacts of each sphere are not entirely consistent. See below for more details.

The heavy water sea serves as the sole source of raw materials for the aforementioned non-Tokamak nuclear fusion power plants since, as its name suggests, it includes a significant amount of heavy water that cannot be consumed and contains deuterium and tritium atoms. Other than PMMA spheres, there are no other significant structures visible to the naked eye in the sea. However, other floating structures, such as small rafts, sailboats, and miniature cruise shipwrecks, are visible at times. The evaporation of heavy water sea is minimal but sufficient to contribute to rainfall when combined with freshwater. The sea is the sole source of the level's radiation hazards, but due to the level’s abnormal nature, the radiation hazards have been reduced to a level that may only cause nausea, headache, and other symptoms during first-time entry. As yet, there have been no reports of wanderers dying of these diseases.

Mental Hazard

Level 667 contains a fully covered mental hazard that undergoes periodic changes, and the following actions can be taken to promote its development:

Consuming any amount of heavy water in the level.
Being injured by a special entity in the level.
Hearing noises at certain frequencies (which vary with location).
Seizing M.T.S.G. devices of others.
Killing a certain amount of domekeepers.
Inhaling heavy water vapor over a long period or contacting surfaces with heavy water.
Long-term exposure to a special PMMA dome³.

The phased promotion effect of the mental hazard does not typically enhance its performance, but it rather directly turns that of the affected to those with a comparable behavior, including but not limited to:

α: Regarding other entities and wanderers in the level as hostile targets and having a non-fatal predatory inclination.
β: Showing an unusual craving for water in the heavy water sea. The purpose of this desire is to simply satisfy hunger.
γ: Robbing the M.T.S.G. of others and destroying their existing blueprints.
τ: Destroying the normal vegetation accompanying the contents within PMMA spheres⁴.
θ: Having a strong desire to approach an unknown coordinate. Dozens of wanderers carrying lethal weapons with unknown intennntions are currently reported missing.

Matter Transmission & Synthesis Gun (M.T.S.G.)

The M.T.S.G. is a unique processing tool exclusively works in this level. Despite its appearance resembling a stream-lined, white "welding gun," it possesses far more functions. It has an embedded LCD at the rear and a side-mounted ionic fluid thruster.

In addition to performing standard welding and melting operations, the M.T.S.G. can process materials (such as crushing, melting, splicing, etc.) on a solid surface according to provided blueprints. It should be noted that the M.T.S.G. can execute these operations regardless of the various physical characteristics of the materials or the phenomena in the Backrooms. Self-controlled processing does not require manual operations, but the M.T.S.G. relies on the ionic fluid thruster to morph its pattern. Due to its intricate internal structure, all current attempts to reproduce the M.T.S.G. have failed. Although having a precise structure, the M.T.S.G. performs remarkably solid and reliable under normal conditions.

When wanderers no-clip into the level, the M.T.S.G. will appear within a circle of about 3 yards from their current location. The M.T.S.G. can be replaced by taking other wanderers' M.T.S.G., however doing so will promote the stage of the aforementioned mental hazard. The M.T.S.G. is the primary and most valuable survival tool in the level, and whether to pick it up depends on the wanderer's situation. For details on how to use the M.T.S.G., please refer to the following documents. The material consumption and technical grades mentioned below are classified according to the M.T.S.G.'s unique built-in identification system.

To charge the M.T.S.G., one has to find specific buildings that have charging interfaces. The use of ultracapacitors allows the depleted battery to be fully charged in around 8 hours. The fully charged battery can maintain a hover state for a maximum of 20 hours. The non-Tokamak nuclear fusion power plants in the level serves as the sole source of all currently known energy resources.

Spatial Anomalies

The environmental stability in Level 667 is in a constant state of flux, with changes usually resulting in disastrous effects. Spatial anomalies known from the summary report are as below:

Curve Drop
The "sky" in the level abruptly collapses in the form of concave triangles and convex triangles in non-Euclidean geometry. Perfectly straight-cut fragments of buildings will roll down from the edges of convex triangles, causing danger to wanderers and PMMA spheres. PMMA spheres are vulnerable to attacks from curve drops that are extremely violent.

Sphere Drifting
Occasionally, PMMA spheres floating in heavy water will drift due to intense underwater disturbance, which will easily result in disconnection of PMMA corridors connecting the spheres or the collision of two or more PMMA spheres, directly leading to the full disintegration of domes. Consequently, the heavy water may flood into originally enclosed spheres, contaminating sources of drinking water and hindering the survival of normal vegetation. Long-term investigation has confirmed that this anomaly is related to excessive use of non-Tokamak nuclear fusion power plants.

Transmission Corridor Blast
When the aforementioned anomalies occur close to the PMMA spheres that contain nuclear fusion power plants, the wireless substations connected to them may sustain damage, causing formation of arcs and flow of current outside of areas designated with danger signs, posing a high-voltage electric shock threat to wanderers.

Entities

Curve Shards
Curve shard is a unique entity in Level 667 that arises from spatial instability. When an instance of curve drop occurs, some fragments from convex triangles will be imposed with an unknown angular momentum, rapidly rotatiing and continuously destroy the objects until they are completely worn. Curve shard is classified as an entity due to its inclination to destroy organic life and distinct trajectory and target during rotation. Report files of this entity was discovered during an investigation of the Unknown Coordinate.

Domekeepers
Domekeeper is a unique and highly intelligent mechanical organism in the level. Its advanced motor nerve center appears to be highly viscous suspensions of brain tissue, making it more resistant to powerful shocks compared to complete robots. However, if the suspension leaks, all of its essential actions will be completely paralyzed.

According to anatomical studies, the tissue cells of the suspension in the cranial cavity of domekeepers communicate through plasmodesmata, which discharge at various frequencies to enable communication. The body of the domekeeper appears to be a dark-green robot that is extremely solid except for its cranial cavity and connecting parts. Its general work is to take care of plants in PMMA spheres. If a sphere is slightly damaged, the domekeeper can restore it by itself. In cases of severe damage, a group of domekeepers can assemble in time and use specialized machinery to restore the dome. Their tools and weapons include PMMA hot-melt guns, gardening tool kits, and stun air rifles.

Domekeepers are friendly to wanderers and hostile to Sharkopards. They are unable to attack curve shards, but when attacked by humans, they will strike back with non-lethal stun air rifles. Sometimes they will seek the help of wanderers when they need to launch the underlying components of specialized machinery. In return, they will usually provide a special blueprint that is difficult to discover elsewhere.

Sharkopards
Sharkopard is the only organic and highly intelligent animals (inferior to humans) in the level. They reside on barriers formed by fragments in the heavy water sea and in submarine bases. The upper part of their body appears to be the front end of the shark, and their legs appear to be those of leopards, covered by sharkskin. Sharkopard cannot use the M.T.S.G., but they are able to acquire weapons with a slightly lower technological level from submarine bases. They possess a powerful short-range explosive force and are amphibious creatures.

Sharkopards are hostile to wanderers and domekeepers, displaying a strong predatory propensity and are open to allowing wanderers suffering from long-term stage τ and β mental hazards to join their predatory groups. They have even been known to attack nuclear fusion power plants⁵, occasionally causing heavy water to pour into PMMA spheres, polluting the source of drinking water. Sharkopards can also bind curve shards with a special lazzo, turning them into a formidable weapon to destroy the dome. This presents a new opportunity for us to explore ways to prevent curve drops. Sharkopard strongholds have been observed frequently recently; we need to pay closer attention to them and continue reporting on their trends.

Plasmaniacs
Plasmaniacs exist in a highly unstable plasma state and their movement speeds vary⁶.They usually appear next to leaky substations under severe electric shock hazards. Despite not having physical bodies, they project a fuzzy human shape composed of current that is capable of paralyzing all nearby electronic devices. The physical hazards of Plasmaniacs have various effects because of various relative positions between wanderers and them, with them as the center: within a radius of 12 meters, wanderers will experience a strong tingling sensation; within a radius of 7 meters, wanderers completely lose their sense of touch but are still able to use weapons; within a radius of 4 meters, wanderers will faint directly; within a radius of 2 meters, wanderers will be instantly vaporized and turn into new and weaker instances of Plasmaniac. S1 (Scale 1), S2, S3 etc. are used as the names for these new instances, up to S6. A native Plasmaniac cannot persist for more than two hours, but Plasmaniacs invading densely populated areas still pose a serious threat to residents. Without effective counterattack strategies, the entire community, including wanderers and domekeepers, will be devastated.

Steel Bustards
Steel Bustards are the most enigmatic mechanical beings with an unknown origin in this level. They resemble birds in appearance and can transport resources. Resources carried by Steel Bustards are diverse materials from fragments on the heavy water sea, confirmed by using specific isotopes distinct from deuterium and tritium. The process of gathering resources at the heavy water sea typically takes 48 hours, and each Steel Bustard has its own operation route. After gathering resources, they will return to their respective route and stay for two hours at the berth of each PMMA sphere. At this point, wanderers are free to take the supplies brought by the Steel Bustard or to place their own supplies.

Bases, Outposts and Communities

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One of the entrances to the M.E.O.D. Base Network "Domeguard".

M.E.O.D. Moderate Base Network "Domeguard"

A base network under the control of the M.E.O.D. that is used to receive wanderers who have entered this level and produce weaponry to be exported to other levels. To this day, the network occupies 24 PMMA spheres and 27 heavy water sea structures. Despite a population of over 6,000 individuals residing in this level, the distribution of inhabitants is extremely uneven. The largest city, City-β, accommodates more than 1,000 residents.

M.E.O.D. Base "Squadron Sharkhunter"

Another large-scale M.E.O.D. base, established to resist large-scale Sharkopard attacks. At present, the base occupies 12 PMMA spheres and 49 heavy water sea structures.

The F.O.J. Outpost

In this level, the Followers of Jerry actively spread their beliefs and utilize Steel Bustards to distribute leaflets about their leader. Under the influence of Jerry, the mental hazards to those followers have been significantly reduced. Their lunatic missionary activities even prevented the M.E.O.D.'s "Parachute Project" to rescue wanderers from being put into operation. After a small-scale conflict with the M.E.O.D., the F.O.J. agreed to do missionary work by painting the Steel Bustards that land on the ground blue and putting slogans on them. At the same time, the M.E.O.D. will place life rafts on such blue Steel Bustards to rescue wanderers in danger. It is suggested that wanderers do not believe the slogans on blue Steel Bustards.

P.R.G. (Pioneer Research Group) Scientific Outpost

The majority of the level's laboratories are occupied by this outpost, which conducts research on the environment of the level and tries to interact with Sharkopards in order to come up with workable solutions to detoxify them, while seeking information regarding their possible civilisation. Whilst being mysterious, it is known through long-term information transaction that they have currently deployed their main research forces to "Blueprint Project", which strives to develop more complex blueprints and produce more advanced equipment as bargaining chips in dealing with other individuals and groups.

Other bases and outposts' personnel are classified as normal residents.

Entrances And Exits

Entrances

Finding a leaflet about "Dometopia" with a "Backrooms Robotics" logo in a wreck in Level 711 and no-clipping into it will lead to this level.
By finding an M.T.S.G. model in Level 207 and smashing it, one will be led to a glass door by a fluorescent pellet that jumps out of the model. Entering the door leads to this level.
Follow the cat to find a domekeeper's corpse in Level 911. No-clipping into the floor under the corpse will lead to this level.
Find a Sharkopard's skull in Level 206. After taking it out, the wall on one side of the hallway will collapse, and an elevator will show up. Entering the elevator will lead to this level.

Exits

Find a steakhouse in the mall. There is a blood-painted wall in the kitchen of the steakhouse; no-clipping into it will lead to Level 611.
Breaking a blue-marked coating and no-clipping into the underlying periwinkle sand will lead to Level 628.
Finding a staff restroom with the number "277" written on the door in the Quadruplet Tower, carrying a mobile phone or other communication devices, and locking and re-opening the door will lead to Level 277.

Survival Guide——Level 667

>	Please enter your communication ID:
	/B2942397002
>	Please enter the section you request access:
	/all
>	Accessing the M.E.O.D. database…

M.E.O.D.

Acting as one on the behalf of many

Reading the following documents will help you survive in Level 667.

FILE-1——First-time Entry:

Almond Water × 20L (At Least)

Used to meet the basic hydration requirements before finding the communities.

Xenon Marbles × 5

Used to quickly locate and find nearby resources.

Reality Freshener × 1

Used to limit the movement of hostile entities in a short distance.

Hyrum Lantern × 1

Used for self-defense and lighting at night.

Firesalt × 40g

Used to repulse hostile entities.

Harpoon Sharkopards

Sharkopards with a low level of ability that can act rapidly with their harpoons and attack with their mouths. A single Harpoon Sharkopard can be directly repulsed using firesalt. When encountering a group of Harpoon Sharkopards, they should flee without being discovered; if you are discovered, please run and hide behind any nearby obstacles.

Shotgun Sharkopards

Shotgun Sharkopards have poor dexterity. The shotgun of this kind of Sharkopard comes from submarine bases, and despite having a limited range, the accuracy of the Shotgun Sharkopards is rather high. The shotgun uses round lead bullets or ordinary steel bullets. Shotgun Sharkopards are not good at close combat and have weak static eyesight. When a Shotgun Sharkopard is alone, wanderers can try to approach it and knock it down to obtain the shotgun - long-range weapons are particularly valuable in this level. When killing a Shotgun Sharkopard, be careful to look around to see if there are other Shotgun Sharkopards hiding nearby and avoid stepping into their area of concentrated fire.

Bombing Sharkopards

Bombing Sharkopards are usually more muscular, utilizing self-made simple bomb-throwers to attack. The old bombs they use is obtained from submarine bases with reformed detonators. Bombing Sharkopards are few in quantity, but they generally only show up in medium and large-scale attacks. If you observe a single Bombing Sharkopard, please shoot it down in time, and we will give you corresponding rewards. Your contribution will help us build a safer community in this level.

Lead Sharkopards

In comparison to other Sharkopards, Lead Sharkopards are easy to identify as they are armed with a shotgun and a Samurai sword and have a bulletproof board covering their front. Under common circumstances, the only way to kill a Lead Sharkopard is to shoot them in the head. Lead Sharkopards are just Shotgun Sharkopards with better defense, but their leadership skills make them fearsome opponents. They can appear in a variety of small and medium-scale attacks, and they usually bring 2 to 4 attendants. As there is no way to estimate how many Sharkopards are still being ambushed nearby and underwater, wanderers should not directly conflict with Lead Sharkopards' team.

Plasmaniacs

If the first place you show up in the level is next to a substation, do not enter the substation unprotected in order to look for supplies. Please immediately evacuate to a location 500 meters away from the substation if you experience intense shaking or see curves falling from the sky, and pay close attention to the transmission corridors in mid-air. The corridor has been overloaded and there is a risk of electric leakage when the outer collars of the corridor turn red. At this time, it is necessary to seek an indoor shelter in time and ground all possible entrances to the shelter with wires. This is a effective method to eliminate Plasmaniacs. When encountering a Plasmaniac while exploring in partnership, you should keep a distance from your partners to prevent them from attacking you after turning into a non-native Plasmaniac. Throwing firesalt at them will block their attacks as it will temporarily scatter their non-physical bodies.

Rogue Steel Bustards

The normal behavior of Steel Bustards is neutral or friendly, but some Steel Bustards may experience component rustiness and switch on their self-defense mode after being submerged in heavy water. experience component rustiness and be activated in their self-defense mode. Their wings become extremely sharp, their airspeed is substantially boosted, and they are in a no-load state in this mode. They launch indiscriminate attacks with their swift wings against wanderers and other entities. When you come across them, don't panic; instead, look for enclosed spaces nearby and, if possible, shoot them down. If you are in city-α, you can seek shelter in the small-scale VTOL airport.

The usage of the M.T.S.G. falls into two cases: self-controlled processing and manual processing.

Self-controlled Processing:

The M.T.S.G. processes an adequate amount of materials in accordance with the blueprint that has been input into it, producing the final product specified in the blueprint. The final product by self-controlled processing has high quality and strong durability. The blueprint must be converted to digital form before being output to the M.T.S.G. through a storage device. When using the M.T.S.G., be aware of its state of charge and the anticipated power usage of the product; at least 10% of the power should be reserved for emergencies.

Wanderers should collect the following basic materials before using the M.T.S.G., including but not limited to:

High-quality Steel
Lead Ingots
Glass Shards
Planks
Baobab Fruits

These materials can be used to make simple self-defense weapons with the simplest blueprint.

Within the PMMA spheres, wanderers should search for a charging interface for the M.T.S.G., which can show up in a variety of small, enclosed spaces like bedrooms and utility rooms.

Preparations before using self-controlled processing:

Check SOC and switch to self-controlled processing mode.
Mark the scanning area with the marker pen attached to the M.T.S.G. on a relatively flat, dark desktop. A rectangular area is recommended.
Select a blueprint.
Place adequate materials.
Launch the M.T.S.G.

Manual Processing:

Manual processing is typically used to process non-blueprint components or to modify surrounding objects in an emergency to use them as a shelter. According to feedback from residents in the level, they generally use the manual processing to make shelters out of some discarded steel plates, to make double glazing for sound insulation, or to make insulation shields out of thick layers of PMMA.

There have been only 4 reports of special use of M.T.S.G., all of which occurred when wanderers encountered injured domekeepers. When they confirm that the wanderers show no hostility, it is said that the injured domekeepers will approach them and request help from the M.T.S.G. According to reports, their M.T.S.G. can fix their limb damage and even fill in holes in their cranial cavities. Wanderers will receive a small communication module in return, which can be used to contact them or even the specialized machinery they use to summon reinforcements in emergencies.

Curve Drop:

Do not panic when curve drop occurs. People working inside the domes should immediately move to the underground area, while those outside the domes should flee to areas with more barriers. A typical-sized curve shard can pierce 6 to 8 reinforced concrete walls that are around 5 meters thick, for example. It is best to leave space of two barrier distances at least to prevent attacks from curve shards.

Sphere Drifting:

The best way to prevent damage from sphere drifting is to prepare life rafts in advance, load them with essential supplies, exit the PMMA sphere and board a life raft two hours before the anticipated collision of the two PMMA spheres, and row the raft to a location 1200 meters away from the sphere within two hours. If you don't have a life raft, you should choose a shallow underground area near the PMMA sphere's center to take refuge. In order for wanderers to quickly clear the escape passage from the debris in an emergency, it is advised that they carry explosives and blasting equipment when escaping.

Transmission Corridor Blast:

As a secondary disaster of the two aforementioned disasters, transmission corridor blast will release a large number of Plasmaniacs, and their presence will result in unimaginable casualties in densely populated areas. When your group encounters a complete leakage in transmission corridors, escape to the inside of a nearby structure, and use pyroil to set the ground in front of you on fire to prevent Plasmaniacs from approaching. Then, use the M.T.S.G. to create an insulation plank to keep Plasmaniacs out. Make sure that all of the Plasmaniacs outside have completely vanished before leaving the structure.

Heavy Water Rain:

The weather outside the domes, where all of the precipitation is almond water or pure water, is very different from the one inside the PMMA spheres. However, the heavy water rain outside the domes poses a serious threat to wanderers. Those exposed to the heavy water rain will start to experience mental hazards, and excessive soaking in heavy water rain can cause irreversible physical damage. When encountering heavy water rain outside the dome or on the heavy water sea, use your M.T.S.G. to quickly create a steel plate with a thickness of about 1 centimeter and a length of 50 centimeters into a foil according to the blueprint, then use it to cover your body to avoid contact with heavy water rain as much as possible.

Sharkopard Pillaging:

A relatively rare disaster brought on by Sharkopards, but just as dangerous as the aforementioned spatial anomalies or natural disasters. Sharkopards frequently organize predatory operations inside the PMMA spheres, but they cannot survive within the PMMA spheres for a long time, so they quickly retreat to their barriers and submarine bases after the operation. Wanderers should stay calm, adhere to the M.E.O.D.'s instructions, be compliant to agreements, and work together to resist invasions when Sharkopards conduct predatory operations.

Locked Information 1 - Overview of PMMA Sphere Structures:

Based on diverse properties of each PMMA sphere's contents, this is a thorough introduction to help you quickly adapt to various situations and make correct decisions in the level. In fact, the so-called "city" is much smaller than a real city; the average radius of the PMMA spheres is merely 300 meters.

Domes

As mentioned earlier, the semispherical domes are made of seamless PMMA doped with titanium dioxide microcrystals. The maintenance of the dome is essential because it serves as the main safety net for the creatures inside. After various disasters or attacks, the dome needs to be repaired as soon as possible, and when wanderers are unable to repair certain sections themselves, they should contact domekeepers to use specialized machinery for repair. There are a small number of steel skylights above the dome for Steel Bustards to berth.

Roads

Roads in the PMMA spheres have limited use because there is little transportation in the level, but they are suitable for arranging defense when trying to stall invasions. triple-layer paving technology is employed for the road. Periwinkle sand makes up the bottom layer, followed by a wood coating made of Brazilian mahoganies and sycamores in the middle, and delustered PMMA plates on top that allow wanderers to vaguely see the strange patterns reflected by the coating below.

Habitation Units

The habitation unit is a collection of large buildings with living facilities in the level. The habitation unit has a uniform appearance, with a futuristic, streamlined architectural outline. It employs minimal indoor and outdoor design and is fitted with high-quality glass with seamless connections.

A single suite of habitation units has a kitchen, bedroom, and bathroom. It also shares a living room, storeroom, and a small interior garden with other suites. This arrangement creates a smaller community around the interior garden, which strengthens the sense of community among the wanderers residing in the unit.

There are M.T.S.G. charging interfaces in the kitchen and bedroom that guarantees the long-term use of the M.T.S.G. The interior garden has a delivery point nearby that appears to be ductwork and is where supplies are periodically dropped. The duct's measured depth is 15.12 meters. Although the origin of these supplies is unknown, it can be determined that the ductwork is separate and has a dead end.

When the PMMA sphere is not seriously damaged, and the transmission corridors continue to work normally, the habitation unit have a sustainable supply of water and power, both of which originate from non-Tokamak nuclear fusion power plants. However, the corresponding relationship between habitation units and power plants is unknown.

In the habitation unit, there is an empty underground area that is connected to the other underground facilities.

Overall, the living space of the habitation unit is adequate, but due to its relatively hollow interior, it is not a suitable place to defend against attacks from Sharkopards. When pillaging occurs, wanderers should retreat to the underground area in time. As per the instruction of the M.E.O.D.'s defense standards, the underground space has been stored with enough supplies for 200 people to survive for 2 months and employed with modified M.T.S.G. charging interfaces, so all defenses should be deployed in the underground area.

The Mall

The mall is actually a large shopping and entertainment complex, but the majority of its entertainment installations have vanished, leaving only a few smaller, single-person entertainment facilities like individual KTV rooms, massage chairs, VR exercise equipment, etc. The mall's shopping area is relatively well-reserved, with a few useful instrument supplies on the shelves.

The M.T.S.G. charging interfaces are easiest to find in the mall, with a charging rate that is 130% faster than the civilian charging interface in the habitation unit. Additionally, the mall's hidden corners contain many advanced blueprints.

The architectural design of the mall is extremely complex, with passages relying on elevators. There are fewer entrances and exits on higher floors, making it easier to defend against attacks and more challenging to attack. Therefore, during the period of defending pillaging, the mall is frequently used as the living center.

City-α appears to be a massive, liminal streamlined architectural complex.

The Estimated Survival Difficulty of City-α

Livability——3

Supplies Adequacy——4

Population Density——4

Dome Theseus

Dome Theseus uses a different type of PMMA which causes the light transmitted into it to appear unnoticeable light yellow, creating a bizarre dusk scene inside the dome. However, this enchanting light can promote the stage of mental hazards, so long-term staying in City-α outdoors is not recommended.

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Dome Theseus.

The Quadruplet Tower

The Quadruplet Tower, located in the heart of City-α, has limited living supplies, but it has a large number of available information terminals and M.T.S.G. charging interfaces, as well as a rooftop parking area.

The exterior of the Quadruplet Tower appears to be a square structure consisting of four cone-shaped spires connected by corridors on the upper part. There is a pool in the center that can continuously pump out Almond Water, which can be used as a long-term source of drinking water. Most intermediate floors have a typical office building appearance, with unusable office equipment. However, some snacks such as chocolate bars, nut candies, freeze-dried fruits, etc., can be occasionally found in the drawers. Luckily enough, even some blueprints can be found.

The base of the Quadruplet Tower has a security site with heavy anti-theft doors. The site stores stun air rifles with the same model as the ones carried by domekeepers, as well as some ordinary gunpowder stored in powder-horns. Basic riot gear such as steel forks, riot shields, teargas, and powerful flashlights can also be found.

The Small VTOL Airport

The Small VTOL Airport is a type of heliport with a radius of about 20 meters. There is a 32% chance of finding a two-seat helicopter without engines here, and below the helicopter is a unique light strip flashing blue lights. The ground near the heliport is equipped with a small terminal building and a narrow power distribution room.

By collecting data from the terminal building and power distribution room, we discovered that two types of aircraft should be parked here, but currently only the helicopter without engines can be found. The other type of aircraft is a quad-rotor UAV. The blue light strip on the ground marks out the wireless charging coil of the transmission corridors, which can directly charge the M.T.S.G.

Another characteristic of the VTOL Airport is its ability to drive away Rogue Steel Bustards, which will retreat to an area 40 meters away from the airport.

The overall appearance of City-β is nothing different from City-α, but there are more plants in the habitation units, most of which are edible. Besides, the underground area of City-β has been heavily reduced, with only its unique underground structures remaining. Overall, it can be classified as a research-centered city, with the most corridor joints.

The Estimated Survival Difficulty of City-β

Livability——5

Supplies Adequacy——5

Population Density——4

The Pit Hotel

The Pit Hotel is usually located by the second ring road of the city center. The main rooms of the hotel are built on the inwall of the area 40 meters underground, and the other components of the inwall are steel caissons discovered through drilling, which are used to maintain the balance and stable floating of the PMMA sphere on the heavy water sea.

There is a group of fountains that periodically spout Almond Water in the center of the Pit Hotel. The living conditions in the Pit Hotel are better than those in the habitation units, so it is also used to accommodate common residents other than the M.E.O.D. combatants. Due to its unique terrain, it is rather easy to protect the Pit Hotel.

Supplies and resources are adequate in the Pit Hotel, making it the top choice for most wanderers to settle down.

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The dome in City-β

The Backrooms Robotics Industrial Laboratories

The Backrooms Robotics Laboratories are located in the northwest of City-β, appearing to be steel spherical buildings built in imitation of the appearance of PMMA spheres. Most of the facilities inside the lab are no longer functional, and even those that still work are easily damaged, making it difficult to operate at full power.

Although it no longer has its former functions, basic quantitative substance analysis research and some simple experiments can still be conducted in the lab. Therefore, several scientific research groups have been deployed in the labs to conduct in-depth research on the recording of the exploration of the level. Currently, the M.E.O.D. has taken control of 14 Backrooms Robotics Industrial Labs.

The exact ownership of the labs is unclear, but it can be learned from some incomprehensible and indecryptable laboratory reports that the laboratory belongs to a large commercial corporation named Corporate, whose logo appears in most industrial areas in the level.

The Spiral Base Station

The Spiral Base Station is the signal source of all Wi-Fi in the level, and the signal strength around the station decreases according to the following formula as the distance increases:

(1)

\begin{align} \it{S}=\it{S}_{0}*e^{-1.2θd} \end{align}

Note: S is measured in signal strength bars, and S₀ is the default value of full strength (5 bars); d is the distance measured in kilometers; θ is the correction factor, which is set at 1.2 as an expected value.

It can be inferred from the formula that Wi-Fi in the level is not fully covered, and the limited number of Spiral Base Stations in the level also leads to signal blind zones in some areas. However, this can be solved by installing specific repeaters in the level, which are necessary in important bases and offices.

The Spiral Base Station is an optical cable clustering signal tower with a special glass core and a steel plate cover. The space inside the tower is extremely narrow, but there is usually a chance of finding repeaters, safety helmets, and empty toolboxes in the maintenance room near the top of the tower, but no food supplies have been found.

City-γ is relatively small compared to the first two cities, with a determined radius of only about 240 meters. Such small area has led to reduction of typical buildings inside the city, but has increased the number of other unique structures in the city, making its structure more complex from both the planar and steric perspectives. All habitation units in the level are located on the outer circle, reaching straight up to the dome, forming a cylindrical internal space with them as the curtain wall. Generally, the central area of the curtain wall is more habitable, but due to the lack of survival resources, only few wanderers choose to live here. Most residents of the habitation units are garrisons dispatched by various groups to scavenge materials.

The odd-numbered floors of the habitation units that make up the curtain wall transform into malls every other half day. However, the supplies that appear in these malls are extremely different from those that appear in typical malls.

The Estimated Survival Difficulty of City-γ

Livability——2

Supplies Adequacy——1

Population Density——2

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The center zone of CIty-γ.

Gun stores

A large structure protruding from the curtain wall that appears during the transformation of the odd-numbered floors of the habitation units.

After several explorations, it has been found that the shelves of this structure store firesalt, conventional gunpowder, and steel bullets of various radius, as well as lead bullets with a large range of time spans. Rarer items are long-range firearms, with the highest record of discovering 5 at once. These firearms include but are not limited to: breech-loading carbines, automatic loading rifles, and the rarest marksman rifles. All firearms except marksman rifles can use traditional gunpowder and firesalt, but may require a ramrod when firing.

The logo of Backrooms Robotics can be found in the gun stores.

Lighthouses

An abrupt structure in CIty-γ.

The Lighthouse is a structure similar to the Spiral Base Station in City-β, with the difference being that it is used for lighting at night. Its light transmits in a wide-range way, making streetlights in City-β unnecessary.

There is a small operation room inside the lighthouse, which is totally empty, without even any report of discovering blueprints. However, the operation room can be used to focus scattered light at a point, making the minimum radius of the lightspot to be 2 centimeters, making the light intensity extremely high. It can even melt the surface of fragile metals and be used as a searchlight to target enemies in night battles.

Waste Treatment Facilities

Waste treatment facilities are specifically used to collect and process various types of domestic waste from habitation units in the level. Currently, only the slots of these waste treatment facilities can be found on the curtain wall. It was discovered that the end of the discharge pipes is a dead end when conducting further investigating, and the furthest visible section of the pipes is a cube block with a side length of 72 centimeters covered with white film.

The devices inside the waste treatment facilities can be started and stopped by using the corresponding touch screen in the central control room, where blueprints can be found. However, the more valuable items in the facilities are film blowers, hydraulic presses, and hammer mills.

The Crystal Spiral

There is only one Crystal Spiral in CIty-γ, located within 12 meters of the central point.

The Crystal Spiral features a steel frame, and uses PMMA as the surface of its steps, which can reach the top of the dome. Occasionally, minimal supplies and some inexplicable notes will appear on the steps of the Crystal Spiral. The following are extracts of the identifiable contents of the notes:

Coordinate (392,0██), heavy gunfire- Backup

Northeast, city-α, sea fragments. Backup, We are running out of t-

Down here. These demons try to kill people with guns. I can't go back.

Amusement facilities, waste spheres, metal… metal, I, I don't remember-

Currently, the M.E.O.D. is collaborating with other groups to conduct joint operations, hoping to find the location mentioned in these notes.

Treehouses

Another abrupt structure in CIty-γ.

Treehouses are built on baobab trees and maple trees that grow on both sides of the curtain wall. The overall layout of the treehouses follows that of a single bedroom. The decoration style inside the treehouses is simple, containing only an external M.T.S.G. charging interface, a vine bed, two nightstands, two bamboo blinds, a set of desk and chairs, and a vine ladder. A blueprint will appear on the desk.

There are no other supplies in the treehouse, but its soothing environment is beloved by wanderers in City-γ. Now, it is generally used as a leisure club or a small conference room.

City-δ is the last city that exists within the PMMA sphere. This city is the second most habitable city after City-β, but has a lower population density due to the extreme mismatch of resources and living facilities. After all, no one likes to live in extremely poor environments with their hard-earned resources. The area of City-δ is not much larger than that of City-γ, with few malls and habitation units, and fairly unitary buildings. Overall, it appears to be a temporarily constructed new city with inadequate facilities.