The player controls a disposable test subject, referred to as D-9341,[4] as they attempt to escape an underground research and containment facility amidst a breach of its numerous anomalies, known as SCPs. During gameplay, the player roams the facility while being pursued by multiple SCPs and MTF units, which must be avoided in order to not die.[2]
One of the game's primary features is procedural generation of the facility.[5] This feature is controlled by a system called seed generation, which is a string of text that controls how a map generates. By design, the layout of the facility in every playthrough will be different, though every playthrough will contain the same key areas and rooms. As the player progresses through the facility, the number of threats present to them increases, including new SCPs which begin to hunt the player. The "Entrance Zone" area also marks the appearance of a Foundation Mobile task force (Epsilon-11 Nine-Tailed Fox), a squad of three soldiers which attempt to recapture SCPs and will shoot the player on sight.[4] The player must then find an exit gate in order to reach the end.
Along the way, the player can find a wide variety of items to assist them in survival. These include tools such as gas masks, various electronic devices, and keycards allowing progression, but there are also items which hinder the player. Some of the items are themselves SCPs, such as SCP-500, which will heal any negative effects.
The game takes place in a containment facility ran by the SCP Foundation, which possesses and researches multiple anomalous artifacts and entities. During gameplay, a breach occurs, allowing numerous entities to exit containment. Throughout the facility, clues in the form of documents and computer terminals are scattered hinting towards how the breach may have occurred.[2]
The player, along with two other test subjects, is forced to perform tests on SCP-173, a concrete statue that can move at high speeds and attack by causing cervical fractures at the base of the skull or strangulation when not in the direct line of sight of a person.[2][4][6] During this testing routine, the system malfunctions, allowing SCP-173 to kill the other two test subjects and escape while D-9341 escapes the containment chamber.[2][4] The site is then put under lockdown, and D-9341 must attempt to escape the facility.
Many other breached SCPs roam the facility, including SCP-106, an entity resembling a decaying old man that attempts to drag the player into a pocket dimension to kill them, and SCP-096, a tall humanoid creature that will chase and kill the player if they view its face.[4] The player must additionally evade an MTF unit (Mobile task force) designation Nine Tailed Fox or E-11, which are the elite Foundation soldiers deployed to recontain the SCPs and secure the facility, as they have been ordered to target and terminate any stray and rogue Class-D personnel. Later in the game, the player encounters SCP-079, a sentient A.I., and learns that it caused a power outage resulting in the containment breach. SCP-079 proposes that the player reactivates the door control system, in exchange for helping the player escape.
After the player follows its demands, four different endings can be reached, depending on choices the player made while playing the game and how the player leaves the facility. After the ending, when returning to the menu, a radio transmission presumably from the Foundation will play detailing events after gameplay. These messages vary largely from ending to ending.[7][better source needed]
The game is highly atmospheric, as Rikkonen felt that the best way to create a truly scary game would be to focus on the environment and soundscape, rather than exclusively the monsters. In an interview with Edge magazine, he said:
When Rikkonen first started working on the game, he was graduating from upper secondary school. While he enjoyed making games, he had always considered it a mere hobby and a "pipe dream". However, after the success of the game, Rikkonen decided to pursue game programming at the University of Turku.
I am a little confused by this whole affair, if I am going to be quite honest with you. Site-09 is not known for having containment breaches. And this isn't because we have such good security that nothing can possibly escape and it isn't because we have only Safe class objects or anything. We don't have any containment breaches, Site Director, because, as you very well know, we do not have any objects that require special containment procedures. Despite this obvious fact, earlier this year, on 15 September 2018, three members of my staff have reported that their was a containment breach of an entity that I have no recollection of and our records have no mention of. With this in mind, in a show of loyalty to my subordinates, I am submitting the following report.
15 September 2018 was a Saturday and, as such, we were operating at minimum staff at the Site. Dr. Quan and I were manufacturing Class-I amnestics in Synthesis Lab 2, to reach the weekly quota, when the two of us caught a whiff of a concerning smell. Fudge. Since I am aware that you transferred to this site from a containment site, and don't have a lot of experience with amnestics, I will explain: During the production of amnestic compounds with Y-909 compound, a few aromatic alcohols and aldahydes are formed, specifically Vanillin, Acetoin, and 4-Anisaldehyde, which, when mixed together in the air, smell strongly of fudge. So, in summery, Dr. Quan and I believed we had an amnestic leak on our hands.
We first checked our distillation equipment for leaks, but found none, so in order to cover more ground, I volunteered to check the amnestic storage tanks while Dr. Quan checked the ventilation. As I was heading to the tanks, one of the few people still around at the site, whom I will refer to as Dr. A to preserve his identity, claims that they saw a reptilian humanoid entity enter the site from the south and break into the Site-09 break room. They claim that the entity was about 1.7m tall and appeared to be carrying a small satchel with an iron bound book resting in it. When Dr. A was discovered by the entity, they claimed the entity rendered them unconscious with blunt force trauma to the head utilizing said book. When Dr. A was recovered after the incident, they seemed to have no bruising or markings of any kind on their body, but they were found unconscious near the break room.
When I got to the storage tanks, I carefully checked the seals and back flow traps to make sure there were no leaks or holes in any of them. When I determined they were all secure, I made my way back to the Synthesis Lab, where I found Dr. Quan had passed out. When I examined him, he appeared to have been rendered unconscious from blood flow restriction to his brain via blocking off his carotid artery. I didn't have much time to examine him, however, since I was rendered unconscious shortly there after and don't recall awaking until after the rest of the ordeal.
Another one of my staff members' testimony, Dr. B, seems to contradict entirely with my account. Dr. B claims that I exited Synthesis Lab 2 after Dr. Quan was already unconscious. They go on to claim that, as they followed me from the shadows, I rendezvoused with the reptilian humanoid and seemed to know them very well. They overheard us talking about an apparent entity being contained in Site-09. It was a humanoid that could manipulate memories that was being studied for use in new amnestics, so they claim. Apparently, the reptilian humanoid and I were in cahoots and planing on helping this entity breach containment. Which is rather ridiculous, I am head of amnestics research, you'd think that if this thing existed, I'd be the one who'd want first crack at it.
After they overheard this, Dr. B claims they were spotted, after they made an involuntary noise, by the humanoid reptile. Analysis after the event shows much the same thing it did with Dr. A, unconscious with no sign of trauma on the body.
Dr. C was apparently just coming into work, when they saw a humanoid reptile, a young woman, about the age of 16, and I exit Site-09 from the north entrance. They claim that they called out to us, and the girl and I hurried away from them, while the reptilian humanoid approached them. Seeing the humanoid reptile brandishing his iron book, Dr. C retreated and attempted to hide in one of the bushes that surrounds the Site. The reptilian human gave up the chase fairly quickly and Dr. C conjectured it was due to the creature not having a lot of time left to do whatever it was he was doing.
The reptilian humanoid regrouped with the girl and I about 150m from the north entrance to the Site, when Dr. C claims that the young woman put her hands on my temples and I fell unconscious. After I was knocked out, Dr. C said that the girl disappeared completely, leaving no trace. The reptilian humanoid then lifted me onto his shoulders and carried me back into the facility.
Dr. C claims that he waited about 20 minutes before re-entering the Site and, upon investigating, found myself unconscious in Synthesis Lab 2, Dr. A unconscious in the break-room, and Dr. B unconscious in hallway 2C.
Upon the resuscitation of all the present staff, no one, besides Dr. C, claimed to have any memory of what happened. Because of this, I ordered a mnestic treatment for everyone present, leading to the testimonies outlined above. Because I appeared to have an account incongruous with the other members of staff, I increased my dosage of mnestics to the threshold of safety limits, but did not recall anything further.
After an extensive investigation of the amnestic pipelines in Site-09, the official conclusion of my team is that an amount of Class-G amnestics leaked from one of the pipes leading to the storage tanks and mixed with some of the Experimental Compound 07 that was being desiccated in Synthesis Lab 1 at the time. We are unsure how this resulted in a mass hysteria event, but further investigations into the reactive nature of these two substances for use in a memory implanting substance is ongoing.
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