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Two-floor room which is a reference to SCP: Containment Breach and the anomaly SCP-173 from the SCP Foundation Wiki. There is a set of heavy doors on the right of the room with a gap in the middle, showing SCP-173 looking out (he poses no actual danger). Up the stairs is a windowed side room and the exit door. The side room is PSS/SS anywhere out of view of the windows.

Guaranteed first room after Submarine Dock #149. Room is split into three main sections: an entry right-turn room with a side room with grated wall that contains one BL1 (Neloprephine) syringe; a middle room that looks and functions as a "side" room with two doors to either section; and an exit section with a downslope ramp to the exit door that resembles OutskirtsDownPlatform. Due to the room being prior to the Crooked spawning, neither Pipsqueak nor Rebarb can spawn here, making the room a deadzone. PSS/SS are behind the crates at the start of the room. Hunted only.

Guaranteed room at the end of the Outskirts in the Hunted Expedition. The room has two sections - an Outskirts section with a curved corridor to the extendible bridge marking the end of the Hunted, and a Blacksite section on the other side of the bridge. The Crooked despawns here after saluting the player and returning across the bridge. One of the side doors opens to a downward staircase which leads to a locked door unlockable by the decrypted code from the radios throughout the expedition, leading to a tram to continue gameplay in the Vault. Given no other entities from previous rooms enter from prior, the room is a deadzone. No confirmed PSS/SS, though the staircase is a theoretical PSS/SS. Hunted only.

"Take My Hand." The Actual End of The Vault/Mantle Extraction gameshow by The Hosts. To finish, the player must walk forwards to the Big Ol' Sphere known as The Vault and collect the Mega Token. After that, the player will be sent to the menu. Congratulations. :)

A room in the Blacksite Administration roomtype consisting of an office directly referencing the starting office area of the videogame "The Stanley Parable" by Crows Crows Crows, with its room name referencing said game's protagonist Stanley, also known as Employee 427. Hiding in any sideroom is PSS/SS. Notably, 1 of the 2 candidates for the current rarest room after Worth The Wait Part 1.

A room that starts off with a long hallway, then branches off into a big library type room to the right. when turning, go to the bookself furthest left and hide behind it for pss.

Sebastian's shop in the Blacksite Administration, always locked, the keycard always spawns inside Sebastian's shop where you can find numerous items for research. PSS/SS inside the shop or behind the walls of the area where the shop is.

One of three possible Warp Zone rooms that leads to Blacksite Administration, the other two leading to Heavy Containment and Oxygen Gardens. The furthest pipe leads to the Administration section, which resembles AdminRoundabout1/2. PSS/SS can be done by hiding behind the warp zone pipe, and behind any of the walls that are not on the node path in the roundabout.

Easter egg room referencing AltiWyre (Alex), the lead animator for Pressure. The room has two side rooms, both on the right, and there are four invalid doors in the middle larger area. The room is coloured white, purple, and red. The side rooms are PSS/SS in the corners out of view. There is also a unique trash bin prop in the room, for some reason.

A rare Easter egg room in reference to the Backrooms creepypasta and fandom. The room begins at the top of a straight downwards staircase, notably lacking a wheelchair ramp or any furniture. Although there is a door at the bottom of the stairs, it is unreachable and never the real door. Walking down the stairs will cause the player to drop, or "no-clip", into the Backrooms section, reminiscent of Floor 0 with yellow walls, carpet, and fluorescent lights. There are a number of Easter eggs around the room such as wall graffiti and a darkened hallway, and eventually you reach an exit back into the Blacksite, which resembles the entrance in Kane Pixel's Backrooms series, such as his video "The Third Test". There are two possible doors to either side of the exit, and Good People can spawn here. The room is a dead zone as there are no lockers, and the Backrooms section is PSS/SS as the nodes and Pandemonium go over the top of the stairs and do not enter the section.

Three-way T-junction with large window at end, through which we can see a large Seek eye - an easter egg referencing Seek and his large, singular eye from Doors. PSS/SS behind crates, desks, lockers or shelves (whichever spawns) near incorrect door.

Straight room containing only a single chair with a bloody cloth draped over it, appearing to be covering a figure (there is nothing actually under the sheets). This is an easter egg to "Mines", a now inaccessible game made by Zeal. What in the game it references is unknown. The room has no other furniture, including lockers, making it a dead zone. There is no PSS/SS.

A room with a very short hall leading to a main section, where there are 2/3 lockers, a tv on the right wall walking in and two speakers. The couch in the middle of the room is a PSS if you hug it, crouch, and look down. Hiding beside the locker near the TV is also a PSS.

Double-floored chalet-like room with skeleton figures and 2 cubes of 500 research currency each. Contains the Party Special purchase, also sold by Rachjumper, and is one of the methods for the Artifice badge. SS is anywhere away from node's Z-shaped path, PSS in any of the upstairs siderooms, away from node's view.

A 3-way cafeteria room in the Hadal Blacksite roomtype. Safe spots depend on where the correct door is, for SS stay anywhere on the wrong way, for PSS stand behind a locker or crouch and look down behind a table near the wrong door.

A double-big-catwalk room with a forest in-between it at the bottom, guided by green lights. // PSS: Behind crates at the right of both doorways.

A room present at the end of the Abomination Chase it has a guarenteed cocktail perinthesine. PSS and SS being next to the box in image 3 or behind the forklift also in image 3. This room is also a deadzone.

A large straight room, on the left houses "Spectrum" which is a small shop that has Rachjumper who will sell the "regular drink" which is $150 and heals the player by 25 hp each time they buy the drink. And the "Party Special" which is $1250 and heals the player slowly until they are full health. This is also another way to get the "Artifice" badge without having to find the gambling or chest room. The entire shop is also safe from the skelepede as it will not go on the platform.

Easter egg room in the Maintenance Tunnels referencing Dead Seater. The main path is straight, however there is a vent that leads to the Dead Seater entrance. The Dead Seater room is locked and needs a code breacher to unlock. There are lots of dead seaters in the room which is a stage, with a microphone on the stage. PSS/SS inside the entire Dead Seater entrance and room.

Long straight room with lowered middle section. The room is devoid of any furniture save for a single desk with one Redeemer inside. The room has no PSS/SS and is dead zone; it is a reference to Decaying Winter, per the room name.

Sebastian's Shop in the Hadal Blacksite roomtype. Node monsters cannot spawn in this room, as it is dark. The keycard-locked door is straight ahead, and a vent leading to the Shop appears in the middle of the room. There is a pit on the right side of the room. The whole shop is PSS, so long as the player is not crouched in front of the vent. The keycard is located on a desk in the left area of Sebastian's Shop. The player can also trade research with Sebastian for useful items that can aid them in their run.

Straight room furnished like a Doors room, from the game "DOORS" by LSPLASH. Not to be confused with the Hotel roomtype, this is a single room that is furnished like a regular Pressure room with the colour scheme and wood/carpet texturing from DOORS, unlike the Hotel rooms which maintains the same blue-black colour scheme as the regular Blacksite while being designed like Floor 1 from DOORS. All the furniture is also coloured brown. There is no PSS/SS in this room.

Sebastian Solace’s shop in the Dredge room type. The room is always dark and locked, as with all other shop variants, and there is a raised platform to the right with steps leading out of the water. On the platform is the vent through which Sebastian’s shop can be accessed. The shop itself looks identical to most of the other variants, and like always the shop interior out of view of the vent is PSS/SS. This room is likely unable to spawn by natural means.

Hybrid easter egg as reference to both Doors and ULTRAKILL. The room is a large curved hallway overlooking a gigantic containment chamber containing a revolving locker-like organism (locker is reference to closets found in Doors) with a large fleshy mouth within, resembling the Flesh Prison from ULTRAKILL. SS by the two invalid doors in the corner in 2nd and 6th images.