When a human subject enters a building affected by SCP-3571 
infestation, all means of entry and exit are sealed through an 
unknown process, with the exception of a single backdoor placed on 
the opposite side of the transformed structure. Pasted rules 
encourage the subject to move quickly through the obstacles and 
traps to this exit, with the promise of escape and “a grand prize”. 
Conditions become increasingly uncomfortable and dangerous with 
the amount of time elapsed, including (but not limited to) high rises/ 
drops in temperature, poor air quality, rising water, heavy fog, 
malodorous scents, caustic substances leaking from unseen 
punctures in the ceiling, and swarms of earthworms. Subjects often 
take notice of these changes, and, in most cases, hasten. Subjects 
acting against the standard “rules” of the course will encounter more 
severe hazards, often rapid accumulation of the course's gradually 
building hazard. These hazards often mount at too rapid of a rate for 
most participants to respond to. 


Means of long-distance communication do not function in affected 
buildings. If multiple human subjects attempt entry at the same time, 
the entry point quickly closes and seals. 


The majority of subjects are killed on the course by the laid 
obstacles. Subjects that reach the end are able to leave through the 


back door. The “grand prize”, usually a briefcase or large sack of the 
subject's native currency, can be located in close proximity 
outdoors. Analysis shows that the currency is counterfeit, made of 
SCP-3571 secretions. 


Addendum 3571-1: Below is the standard “rules” paper printed in 
SCP-3571 affected buildings. While this is the most standard 
template, variations exist. These variations often discuss the same 
or similar rules, albeit with different ordering and/or wording. 


WELCOME TO (course name), AN AMAZING AND 
AWE-INSPIRING OBSTACLE COURSE THAT WE 
MADE JUST FOR YOU! THESE ARE THE TOP TEN 
RULES THAT YOU NEED TO KNOW TO BECOME A 
WINNER! 


. STAY ALONE FOR MAXIMUM CHALLENGE! 

. DON'T TRY TO EXIT BEFORE YOU FINISH! 

. DON'T DALLY! 

. NO FOOD OR BEVERAGE ALLOWED! 

. NO SMOKING! 

. TRY YOUR BEST! 

. DON'T BE SCARED IF WE WATCH, WE'RE JUST 
CHEERING YOU ON! 

8. IF YOU LOSE, DON'T BE A SORE LOSER! 

9. FAILURE TO ABIDE BY THESE RULES MAY 
RESULT IN IMMEDIATE ELIMINATION! PLEASE 
DON'T BE NAUGHTY! 

10. HAVE LOTS AND LOTS OF FUN!!! 


NOOR WD — 


Addendum 3571-3: 
+ Interview Log 3571-4 
Interviewed: Jacob 
Interviewer: Dr.H C 
Foreword: Jacob had filed a report to local authorities 


and press detailing an unusual and hazardous 
modification to his home in , WV. Mr. 's report 


contained details consistent with SCP-3571 infestation. A 
small team had been sent to investigate, and Mr. was 
interviewed by Dr. C .Mr. — was informed that the 
interview was for a local press report. The interview has 
been abridged for brevity, but noteworthy details have 
been unedited. 


Dr. C : Good evening, Mr. Jacob’. We'd 
like to ask you some questions for a news 
story we're working on. 


Mr. : Yeah, you mentioned it to me 
yesterday. 


Dr. C : Could you recall your experience 
from the beginning? 


Mr. :!came home from work, like any other 
day, and when | tried to go in my house, the 
door was stuck. | used my key, my spare key, | 
was even thinking about calling the locksmith. 
The door budged after 10 minutes, just as | 
was about to give up and call somebody. 


Dr. C : Continue. 


Mr. —: Well, | walk in, and | don't recognize 
the place. | don't mean it like somebody broke 
in and ransacked it, | mean it in a more literal 
sense. The walls looked like they were made 
of old filthy limestone, cobwebs and dry dirt 
absolutely everywhere. The floors were stone 
too, tiled stone, a little like cobblestone. Even 
the little “Welcome Home’ doormat | owned 
had been replaced with a slab, lying on the 
ground. It had something like "Creepy Carl's 
Crypt" or something along those lines just 
scrawled on it, in bright red paint. Had a little 
picture of a ghost , like a “Pac-Man” ghost, ina 
weird, runny purple paint. 


Dr. C : Did you immediately proceed? 


Mr.  : No.1 thought | just wandered into 
some other building, maybe the heat was 
getting to me. | walk back to the door, and it's 
stuck again. | still thought | wasn't in my home, 
but to be sure, | pulled out my keys. My key fit 
into the lock perfectly, but the door was still 
being stubborn. | was beginning to freak out. | 
had no clue what was happening, it was like a 
dream. | tried to call a locksmith again, but this 
time, there wasn't any reception in the house. | 
figured | could find a window somewhere and 
break through, so | went forward from there. 


Dr. C : Was there anything else of notice 
before you proceeded? 


Mr. : There was a printed piece of paper 
taped to the wall, in a red typeface. It talked 
about rules for an obstacle course. | would 
have been wracking my brain trying to figure 
out who would be crazy enough to break into 
somebody's home and turn it into an obstacle 
course in under 8 hours, if | hadn't read the 
last rule. “DON'T DALLY, SALLY!” 


Dr. C : Could you describe the building's 
interior from there? 


Mr. : That 1st room had three big lanes, and 
occasionally a huge boulder would roll straight 
down one, lightning fast. | ran down the middle 
lane, hoping to make it before another rolled 
down. The hallway must have been at least 
100 yards forward, but the lanes weren't very 
wide. A boulder rolled right down mine, and | 
hopped to the right-hugging lane. Two more, 
one middle and one right. Barely made it to the 
left. You get the idea? | made it to the end, out 
of breath, but | didn't want to find out what 


would happen if | “dallied”, so | just pushed 
forward. 


Second room was a wider hallway, torches on 
the lower half of the wall, about up to my sides. 
| stopped to look, and half the torches spat 
flames. Every other one on both the right and 
left. | took my time, | felt if | went too fast, I'd 
fuck it up. | had a nice pace going before | felt 
it getting awfully hot. | wrote it off as the heat 
from the torches, but it just kept getting hotter, 
and the torches weren't any brighter. | figured 
that this must have been the punishment for 
taking so long, the building would cook me if | 
took my time. | winged it. There wasn't much 
of the hallway left, but by the time | was close 
to the door, one of the flame jets caught me 
right on the left side. My shirt caught fire, and | 
had a nasty burn right below my chest. Want 
to see? 


Dr. C : That won't be necessary, Mr. 


Mr. : Oh, figured you'd want it for your report 
or something. 


Dr. C : Please continue. 


Mr. : Next room, and thank god, the last, 
was a big, open room. Looked kind of like a 
gymnasium, with how high the ceiling was and 
the width... it made me realize that there was 
no way this would fit in my house. In the center 
of the room was a big puppet of a mummy, 
and the strings were visible even from a 
distance. They went all the way up to the 
ceiling. Somebody was pulling it, because it 
was floating forward, no actual life in its 
movements... | got closer and saw that it had 
knives sloppily taped on the hands, but there 
was enough tape for it to stay on, by the looks 


of it. Just flew forward, swung the hands. 
Moved way faster than | could, and the heat 
did me no favors. It was cutting me up pretty 
bad. | did make it to the end, and there was a 
door, as well as a sign with 
“CONGRATULATIONS!” on it, in red neon 
lights. | walked out, everything was fine, and | 
sure as hell never tried to go back in. There 
was a briefcase with cash in it though, that 
makes up for it a little bit. 


Dr. C : Understandable. Did you see 
anything alive in or near your house during the 
event? 


(Mr. pauses, and turns away for several 
seconds.) 


Mr. : Well, now that you mention it, there 
were a lot of worms. Earthworms. They barely 
squirmed, but they were facing me. | didn't 
really stop to think about it, | thought it was just 
part of the crypt theme. 


(Mr. _ briefly pauses again.) 


Mr. : Actually, the mummy's strings looked 
kind of fat and pinkish. Real creepy, looking 
back. 


Dr. C : Noted. | think we're finished. Thank 
you, Mr. 


Mr. : Anytime. 


Closing Statement: Investigation into SCP-3571 
infection continued. The building was demolished under 
the cover story of a house fire. Mr. __, all involved 
authorities, and involved journalists were issued Class-C 
amnesics, and all associated written reports, video 
documentation, and photographs were confiscated. If the 


information from Mr. is correct, SCP-3571 instances 
play a larger rule in the nature of the core courses in 
affected buildings than once believed. Further study is 
ordered. 


Addendum 3571-7: 
+ Test Log 3571 
Test 3571-5 


Subject: D-9277, a physically healthy 
Hispanic male, aged 38. 


Procedure: D-9277 was placed inside a 
derelict building affected km from Site-66. A 
digital camera was strapped to their forehead 
to record the exploration. 


Prelude: Subject enters. Signage reveals the 
name of the course to be “FEROCIOUS 
FREDRIK'S FLAMING FORT OF FEAR!” 


Notable Structures: Room #1 a conveyor belt 
spanning from the entrance of the hall to the 
exit stationed on the floor. Large presses 
impact the conveyor belt at a constant and 
regular pace. 


Room 2 lacks stable footing, molten rock 
covering most of the floor. Carpets and 
furniture float on the surface, undamaged by 
the conditions. Placement of the carpets and 
furniture prompt subject to leap from one 
stable surface to another. Subject misses the 
jump between an armoire and a carpet. 
Subject perishes by falling into the molten 
rock, believed to have succumbed near- 
instantaneously due to burns. 


Analysis: How molten rock was placed in 


Room 2 as well as the methods used to secure 
the furniture and carpeting from burns in 
unknown. Room 1 demonstrated the 1st 
appearance of a complex mechanical 
contraption in an SCP-3571 infected building. 


Test 3571-27 


Subject: D-28417, Caucasian male aged 25. 
Physically unfit, suffers from malnourishment. 


Procedure: Subject was placed in Testing 
Structure-3571-B, a building constructed for 
the purpose of examining the long-term effects 
of SCP-3571 on susceptible structures. 8 
previous subjects had entered in the past for 
testing, 7 of whom had perished inside. 
Researchers also noted the sharp decline in 
local animal populations after Testing 
Structure-3571-B was constructed. As with 
previous tests, the subject was given a digital 
camera to strap on his forehead. 


Prelude: Subject enters. Signage reveals 
name of the course to be “WACKY WILLY 
AND WILD BILL'S TRAPS OF TRULY 
TREACHEROUS TERROR!" Subject begins 
course. 


Notable Structures: Room #1 is a large, open 
room. The flooring of the chamber is coated in 
dead leaves. The footing of the room is 
unstable, many pitfalls lie concealed in the 
room. Subject verbally notes that the holes 
appear as though “something really big made 
them”. 


Room #2 is densely packed with 14cm thick 
iron bars that span upward from flooring and 
into the ceiling of the room. The iron bars are 
electrified. Subject remains in the room for 6 


disappearance was observed. 


The object first came to the Foundation’s attention on October 5th, 
2 when Marshall inadvertently used it to find his father, who 
was serving a life sentence at Penitentiary, | km from the 
object's original location. The prison’s security staff detained Mr. 
Marshall soon afterward. Questioning was carried out by Agent 
who was working undercover as one of the facility’s guards. 
SCP-462 was immediately located and moved to Site without 
incident. 


3 


« SCP-461 | SCP-462 | SCP-463 » 


additional minutes. A vapor, likely water vapor, 
from an unknown source, begins to flood the 
room. Visibility is reduced by eventual fog 
buildup. The subject moves forward. 


Room #8 is wide and open, with soil, foliage, 
and trees occupying much of the space. The 
subject continues to walk for about 7 minutes 
before encountering an entity in hiding in the 
brush. The entity seems to be a grey squirrel 
(Cirrus carolinensis), albeit deceased, with its 
bodily movement being forced by earthworms 
inhabiting the body both internally and 
externally. Over the course of the exploration, 
the subject discovers a variety of woodland 
animals local to [DATA EXPUNGED], the 
deciduous forest surrounding Testing 
Structure-3571-B. Observed fauna included 
one American black bear (Ursus americanus), 
three deer of an unidentified species, (one 
doe, two bucks), and 31 additional grey 
squirrels. Every one of these woodland 
animals had the same abnormality as the grey 
squirrel, appearing dead and being infested 
internally and externally with earthworms. As 
additional time passed, animals of unidentified 
species were observed. Most seemed 
mammalian, and bore resemblance to 
mundane woodland animals from the area, but 
noticeable physical deformities were noted. 
These deformities included additional limbs, 
eyes, heads, fused limbs, a lack of limbs, 
extremities, and other similar appendages, 
lack of fur or skin, and severe necrosis. 
Several plants also bore this affliction. 


Later in the test, the Subject was mauled by an 
unidentified entity. Footage of the creature 
shows that it bore resemblance to an 
American black bear, lacking skin and sporting 


long, prehensile limbs tipped with what 
resembled pedipalps found on scorpions and 
related arachnids, made of bony tissue. While 
the entity lacked eyes, three hollow eye- 
sockets were observed, two in a standard 
location for a bear, as well as one on the 
center of the entity's forehead. 


Analysis: This exploration suggests that 
SCP-3571 is able to manipulate multicellular 
biological life, although how is unknown. Due 
to the difficulty involved in observing the 
process SCP-3571 uses to alter matter, it is 
unlikely that it will be observed manipulating 
biological organisms in detail in the 
foreseeable future. 


Test 3571-30 


Subject: D-68901, a physically fit Caucasian 
female, aged 38. 


Procedure: Subject was placed in Testing 
Structure-3571-D, a building constructed for 
the purpose of examining the long-term effects 
of SCP-3571 on susceptible structures. 11 
previous subjects had entered in the past for 
testing, all of whom had communications cut 
off from an unknown cause. As with previous 
tests, the subject was given a digital camera to 
strap on her forehead. 


Prelude: Subject enters. Signage reveals 
name of the course to be “OLLIE'S 
OBSTACLE COURSE OF OBVIOUS 
OBLITERATION!" Subject begins course. 


Notable Structures: Room #1 had crudely 
erected tombstones scattered in a grid-like 
formation. The gravestones have simple 
symbols engraved on their surfaces, although 


these symbols match no known language, if 
any. 


Room #2 contains a large mechanical 
structure, erected in the shape of a funnel. 
Footage shows an uncounted amount of 
mammailian bodies, including rodents, canines, 
felines, and humans. Review of the footage 
has failed to identify the bodies, which were in 
an advanced state of decomposition. 16 
human bodies were counted, which was noted 
to exceed the number of test subjects.