During the event of April Fools of April 1, 2019, SCP: Secret Laboratory was given a patch to change large portions of the content to joke around with the players for the holiday.

SCP Changes



SCP-939 was changed into "Evil SCP-999", based off of SCP-999. Other than changing the model to an orange blob, the black and white vision of SCP-939 was changed to orange and white. The sound made when attacking humans was pitch shifted up.

Related Sounds

Description Sound
When attacking. (#1)
When attacking. (#2)

"Mr. Nut-173"


SCP-173's appearance was changed to resemble the peanut statue in the "This Pleases the Nut" meme.

The model features having a second row of teeth, the lips specked with blood and a menacing grin. Mr. Nut also has crooked arms attached to its sides, as well as short unarticulated legs.

When Mr. Nut killed a person, the sound of their neck being snapped would be replaced by a low fidelity chuckle, presumably by Mr. Nut.

Mr. Nut-173 reappeared in the Halloween 2020 event but was renamed as "Mr. Nutty".



SCP-096 had its model changed to an obese version of SCP-096, as well as having its voice pitch shifted down.

Human Class Changes

Class D


Class D personnel were given missing heads and hands during the event, only having their beanies and eyes left behind, the latter of which would gyrate frequently. Upon spawning as a D-Class, the class message and description would read the "You Are D-Boy" with "This meme is kinda dead, whatever..." below.



Scientists had their model was altered to fold in onto itself, with everything above the fold showing an inside-out scientist, from the hips to the center of the chest.

Facility Guards and MTF Operatives


Facility Guards had their names changed to "Most Worthless Class" with their gray camo suits changed to a purple/pink shade.

Each of the MTF classes had their names changed. Their heads were also absent, only leaving a helmet.

Chaos Insurgency


Chaos Insurgency operatives were without their heads, with only their gas masks remaining.


SCP-106 Containment Procedure


April Fools SCP-106 re-containment sequence - SCP Secret Laboratory

When the containment sequence for SCP-106 was completed, the resulting sound of the Femur Breaker was replaced with rave-style music alongside an edited version of the Femur Breaker scream to match up with the beat.

Alpha Warhead Detonation Sequence


Alpha Warhead Detonation sound (April Fools 2019)

When the Alpha Warhead was first started in a match, the CASSIE system would play an edited version of the typical warning about the Warhead going off, playing a parody of John Denver's "Take Me Home, Country Roads".

Events in SCP: Secret Laboratory
2018 April Fools (2018)Halloween (2018)Christmas (2018)
2019 April Fools (2019)Halloween (2019)Christmas (2019)
2020 April Fools (2020)Halloween (2020)Christmas (2020)
Other Clutter System
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