SCP-2166's anomalous effects are believed to manifest upon 
completion of the first Foot Pope chant call-and-response’. When 
the chant has been said, all players who are designated "out" during 
the round find their feet permanently affixed to the ground they are 
standing on until the end of the round. Attempts to circumvent this 
situation by removing articles of clothing worn on feet are 
unsuccessful; said clothing will also remain permanently affixed to 
the individual. 


Those affected by SCP-2166's primary effect report feeling only mild 
discomfort. It has been determined that should an individual affected 
by SCP-2166 sit down while affixed to the ground, they will find that 
they are able to adjust their position freely so long as they retain 
some contact with the ground they were previously standing on4. 


Investigation into further nuances of SCP-2166's gameplay and 
modification potential is ongoing (see Addendum 2166-2). 


Addendum 2166-1: Based on partial interview data collected by 
Foundation field agents, it is believed that knowledge of 
SCP-2166 originated at Geyser View Elementary School of 
Portland, Oregon where a primary-grade student introduced the 
game instructions to other children during recess. School documents 
show no record of such a student in the district system, and no 
guardian figure was ever seen accompanying the child; rather, the 
child simply stated that they were to wait for their friends at "the 
library" after class was dismissed. Staff of libraries within walking 
distance of Geyser View Elementary School report that they have 
never seen the child before. 


Addendum 2166-2: As of / /  , experimental staff-monitored trial 
playthroughs of SCP-2166 have uncovered the following 
information: 


Based on empirical observation, there are only two ways to end 
SCP-2166's anomalous effects. The first is for a round of SCP-2166 
to end naturally, with a new Foot Pope either starting another round 
or declining to say the starting chant. The second (discovered in an 
experimental Foundation facility) is for a current Foot Pope to 
declare, "No land" in response to the players’ chant, at which point 
the game has ended and any immobilized players are freed. 


It is believed that a game of SCP-2166 can continue indefinitely, 
with the accompanying anomalous effects enduring until a game is 
properly ended. Currently, the longest Foundation-held game of 
SCP-2166 was recorded at approximately 133 minutes. 


Attempting to cheat during SCP-2166 (including deviating from the 
rules, arguing with a Foot Pope, and leaving the game early) has 
resulted in participants experiencing an unpleasant "burning" 
sensation in their feet until the conclusion of the current round of 
SCP-2166. In one extreme case, the involved individual's shoes 
disappeared and reappeared permanently affixed to their ears until 
the conclusion of the game. 


Misspeaking the "Foot Pope" chant, whether by accident or 
intention, results in all the players (including the active Foot Pope) 
having their feet affixed to the ground until the chant is said properly. 


Footnotes 

1. Different iterations involving greater numbers of players take into 
account more complex terrain such as climbable playstructure 
equipment, the introduction of a "Foot Devil" that can "freeze" 
players, and other such modifications. 

2. Acceptable terrain includes asphalt, concrete, woodchips, sand, 
grass, dirt, running track, and so on. 

3. All Foundation-run trials attempting to replicate manifestation of 
SCP-2166's anomaly failed when the preliminary chant was not 
completed at least once. 

4. This effect persists even with removal of the section of ground the 
player stood on from the rest of the terrain space; the player simply 
moves with the section of ground removed. 


« SCP-2165 | SCP-2166 | SCP-2167 » 


SCP-2167: Demon Gate Amplifier 


Item #: SCP-2167 
Object Class: Euclid 


Special Containment Procedures: SCP-2167 is to be stored ina 
soundproofed containment locker, connected to a CD player, four 
5W speakers measuring at minimum 4 on the infinite grade 
impairment scale! (hereafter IGIS), and a 12VDC 5A uninterruptible 
power supply with at least 300 amp-hours of capacity. The speakers 
are to be positioned around SCP-2167 at 90+5° angles ata 
maximum distance of 0.5 m. The locker is also to contain a small 
number of music CDs and vinyl records containing non-sensitive 
material alongside SCP-2167. 


All adjustment knobs on SCP-2167 are to be kept at the minimum 
possible value. The CD player is to be configured to continuously 
play classical music at a very low volume. 


No other speakers or audio devices are to be brought within 10 m of 
the containment area at any time, or used in areas directly above or 
below containment. All sound recordings are to be stored securely 
and deleted once no longer needed. 


SCP-2167 is to be internally inspected at least once per month for 
any signs of wear or potential failure of any of its components. Any 
components showing signs of wear are to be replaced. All 
electrolytic capacitors are to be tested, and any capacitor showing 
values outside its nominal tolerance is to be replaced with an 
equivalent part. 


All testing is to be conducted in a soundproofed room measuring 
4.8 m wide, 7.8 m long, and 3 m high?. Except per specific testing 
protocol, SCP-2167 is to remain connected to the CD player and 
UPS at all times. During standard testing it is to be connected to a 
pair of 25W speakers scoring at minimum 5 on the infinite grade 


impairment scale. The speakers and a chair are to be positioned ina 
golden cuboid arrangement as per document 2167-F. 


Description: SCP-2167 is a "Gauchito-78" audio amplifier 
measuring 100mm wide, 190mm long, and 60mm thick. The 
amplifier case is made of unpainted cast aluminum-zinc. The front 
face of the device has three adjustment knobs, with the labels 
"gain", "volume", and "tone" etched into the case, as well as a script 
logo giving the device name and an unknown graphic icon. It 
possesses two 1/4" audio jacks located on either side of the device, 
and a 12VDC barrel jack located in the top edge. 


When connected to a set of speakers, a power supply, and an audio 
source via the jacks on its sides, SCP-2167 will function as a signal 
amplifier, amplifying the signal voltage according to the position of 
the "gain" knob, and performing high-frequency filtering according to 
the position of the "tone" knob. 


Computer measurements of the audio output indicate that the 
physical intensity of sound emitted from a speaker driven by 
SCP-2167 is typical for a hobby audio amplifier. However, any 
subject who listens to SCP-2167's output will perceive it as being 
much louder than would be expected for non-anomalous sound with 
the same physical intensity. The perceived loudness corresponds to 
the position of the "volume" knob. 


The psychoacoustic loudness $S_{out}$, measured in sones, is 
characterized by Equation (1), where $S_{in}$ is the expected 
loudness as determined from physical measurement, $k_v$ is the 
position of the "volume" dial in the range 0-10, and $ H (m,n)$ is the 
real extension of the Ackermann-—Péter function. 


(1) 
\peginfequation} S_{out} = H (k_v, c_1 S {in} ) \end{equation} 


ci has been experimentally determined to be approximately 0.93. 


Experiments with volume settings higher than around 4.5 have not 
been able to determine if this trend continues, as the intense pain 
interferes with the subject's ability to accurately gauge the loudness. 


Chronic exposure to SCP-2167 does result in permanent hearing 
damage as would be expected from non-anomalous sounds played 
at the perceived volume, but does not lead to total hearing loss. 
Acute exposure over a short period does not result in permanent 
hearing loss. 


High-quality recordings and subsequent reproductions of 
SCP-2167's output are able to produce the same effects on listeners 
as SCP-2167 itself. This also extends to sufficiently high-quality 
digital recordings. The effect does not manifest if the combined 
processing yields an IGIS of under 4.7. 


When disconnected from a set of speakers, SCP-2167 will cause 
nearby sets of speakers to vibrate on their own, producing audio 
output as if connected to SCP-2167. Additionally, when not provided 
with an audio source, SCP-2167 will instead output the contents of 
random audio recordings nearby. This may include potentially 
sensitive or infohazardous recordings, and may compromise 
security or result in other containment failures. SCP-2167 also 
manifests both of these effects when disconnected from a power 


supply. 


The area of effect relative to SCP-2167 can be modeled by the 
inequality $l(\vec x) > 0$, where $l(\vec x)$ is described by Equation 
(2). 


(2) 

\begin{align} I(\vec x) = 1 - {\left\|\vec x\right\|}\int_0*1 p(t\,\vec x)\, H 
\left(-\frac{\partial p(t\,\vec x)}{\partial t}\right)\; dt \end{align} 

(3) 

\begin{align} p(\vec x) = c_2 \sum_i \log(q_i + 1) \exp( -c_3\left\| \vec 
x - \vec v_i \right\| *2) \end{align} 


In these equations, $\vec v_i$ and $q_i$ represent the location 
relative to SCP-2167 and the IGIS of all audio devices, $H(x)$ is the 
Heaviside step function, and co and c3 are constants whose values 
have experimentally been determined to be: 


Co = 6.152 m1 
c3 = 0.468 m-2 


In the case of the second effect, $l(\vec v_i)$ represents the (non- 
normalized) probability that a given recording will be played. 


+ show affected area simulation 


Red dots represent affected devices, while green dots represent 
unaffected devices. Color intensity indicates the device's IGIS value. 
The blue dot is SCP-2167. Black/grey/white indicates | value. Click 
and drag to move things around. If it doesn't work for you, try it at 
this link. 


Disassembly and examination of SCP-2167 reveals a fairly 
advanced construction for the supposed date of manufacture based 
on its outer appearance. 


The amplifier circutry consists of a green double-sided fiberglass 
printed circuit board with white silkscreen printing on one side, 
measuring 80mm by 150mm and containing all through-hole 
components. The external controls, audio jacks, and power are 
connected to the board via 16-gauge insulated lead wires. 


Analysis of circuitry indicates an operating principle much different 
from conventional audio amplifiers. 


Of particular note about this board is its unusual component 
arrangement. The board features a silkscreened seal of Solomon 
occupying the main portion of the board, and its various components 
are arranged to correspond with the glyphs of the seal, and the 
traces are arranged to follow the seal's pattern. 


Also of note is the unusual integrated circuit featured in the center of 
the board. The IC is packaged as a 15-pin TO-3 metal can package, 
measuring 8mm high and 22mm in diameter. The IC is marked as a 
"PL LM21D67", with a date code "7616" indicating it was 
manufactured in the 16th week of 1976. 


There are no IC manufacturers that have been known to use the 
manufacturer code "PL", and a "LM21D67" chip is not known to 
have been produced at any time by any manufacturer. 


Scanning electron microscopy imaging has revealed unusual 
structures on the silicon IC die inconsistent with any known theory of 
operations. 


+ show SEM imagery 


Currently the most credible theory regarding its operation is that 
SCP-2167 takes advantage of the so-called "demon effect", using 
the interactions of its eponymous demon particle with electrical 
currents, to create high-linearity demon gate junctions capable of 
amplifying a signal with very low loss of fidelity. It is still incompletely 
understood how this enables SCP-2167 to manifest its anomalous 
properties, but research is ongoing. For a more complete 
explanation of demonics see A Brief Explanation of Demonics. 


Addendum-01: Device Documentation: The following 
documentation was recovered from the residence of W 
following the seizure of SCP-2167 from his possessionon - - . 


Gauchito 78 Mini Amplifier 

The Gauchito 78 is a innovative, cutting edge amplifier, 
which combines solid performance with the new 
patented Overamp feature to create the perfect compact 
amplifier. It is advantageously small, and it packs a big 
punch with its massive output volume and clean, crisp 
sound. 


Gauchito 78 Overview: 


* 20 watt compact mini amp 

« Patented Overamp feature allows you to really 
crank it up 

« Uses new Demon Gate Amplifier technology. 
Solid-state demonics allows for unprecedented 
reliability and sound quality 

¢ DC or independently powered 

Revolutionary sonic performance 


Features Overview: 


SCP-246: Prophetic Projector 


Item #: SCP-246 
Object Class: Safe 


Special Containment Procedures: SCP-246 is to be kept ina 
wooden crate within Site- 's secure storage. Researchers who 
requisition its use for experimentation are responsible for their own 
room arrangements. SCP-246 is otherwise not to be removed from 
its container, especially for recreational use. 


Description: SCP-246 is a 16-millimeter film projector. When 
activated, SCP-246's projection lamp lights up and the reels begin 
turning. When the projector is pointed at a screen or other white 
surface, a film appears, even though SCP-246's film (hereafter 
referred to as SCP-246-01) does not pass in front of the projection 
lamp. 


The film feeder has been welded shut, making any attempt to load 
SCP-246-01 into the second reel impossible. Requests to cut 
through or replace the feeder have been denied, due to the 
possibility of inadvertently breaking SCP-246. Examination of 
SCP-246-01 suggests that it is blank while inert, though high-speed 
photography shows images on the film when SCP-246 is in its active 
state. Analysis of these images is underway. When replaced with 
any other roll of 16 mm film, SCP-246 continues functioning as 
described below. After using SCP-246 with a reel other than 
SCP-246-01, that reel exhibits similar properties to SCP-246-01. 
Microspectrometer analysis of reels made blank by SCP-246-01 has 
shown anomalous forms of [REDACTED]. Further analysis by 
Foundation researchers other than Dr. is not permitted. 


Despite SCP-246-01's content or lack thereof, when activated, 
SCP-246 projects a short film in the style of 1950s educational films. 


SCP-246 seems to have a limited degree of awareness, as a female 


Independently Powered: 

The Gauchito 78 can be operated independently of any 
external power supply, for when you need to rock it out 
on the go. Or, connect it up for even higher-quality sound 
and superior performance. 


Demon Gate Amplifier circuitry: 

The Gauchito 78 uses the new DGJT demon gate 
junction transistor, the latest in solid-state demonics, 
making it a new standard for audio amplifiers with its 
superior sound quality. 


Patented Overamp Technology: 

No longer be limited by your other equipment! The 
Gauchito 78's patented Overamp feature allow you to 
turn up the volume 'to infinity and beyond’. 


Footnotes 

1. Seehttp://soundexpert.org/documents/10179/11017/se_igis.pdffor 
information regarding the methodology to determine this. 

2. These dimensions are those of a golden cuboid; this geometry 
provides excellent sound damping. A smaller room may be used 
instead, but the ratio of side lengths need to remain the same. 

3. Similar markings are likewise noted in the schematics recovered 
forSCP-1576. 


« SCP-2166 | SCP-2167 | SCP-2168 » 


SCP-2168: Progress 


Item #: SCP-2168 
Object Class: Keter