SCP: Secret Laboratory

The game features a proximity chat system which allows the various human classes to talk to each other across short distances, although Mobile Task Force Units are given a radio which allows them to communicate over longer distances provided they are within range of one another. Spectators and SCPs are given their own private voice channels which will always work regardless of distance. 2 SCPs, SCP-939 and SCP-079, can use the proximity chat system to talk with nearby humans as well as in their exclusive voice channel.

• In the Surface Zone, there is a room where players can activate a nuclear warhead. Activating the nuclear warhead starts a 1:30 countdown. Players can stop the nuclear warhead by disabling it in the warhead room, more commonly known as the "nuke room", which is in Heavy Containment. The nuke must also be initiated here before it can be activated on Surface. When the countdown reaches 10 seconds, players can no longer disable the warhead. Upon explosion, all players outside the Surface Zone are killed, and the facility becomes inaccessible.
• The Micro High Intensity Discharge ("Micro H.I.D.", commonly shortened to "Micro") is a powerful weapon which can instantly kill humans and deals massive damage to SCPs, usually killing then rather quickly. However, it must be charged up for 5 seconds before firing, and is very loud and distinctive. It has its own room, which requires a high-level keycard to access.

Players can play as several hostile supernatural entities contained by the SCP Foundation (classified either "Euclid" or "Keter" according to the difficulty of containment) that have broken from their containment with violent intent. There are seven different SCPs that can be played.

• SCP-049 is a bipedal, avian humanoid creature with skin and chitin that gives the appearance of a plague doctor. SCP-049 has a close-range attack that instantly kills the target. SCP-049 can revive enemy players, converting them to their team as SCP-049-2, a process that takes more time the more players revived this way.
  • SCP-049-2 are reanimated humans created by SCP-049. SCP-049-2 have more health than regular human players, but can only use melee attacks. SCP-049-2 regain health when in the vicinity of SCP-049.
• SCP-079 is an artificial intelligence contained on an Exidy Sorcerer. SCP-079 can hijack Site-02's electronics, tampering with doors, elevators, lights, and the Tesla gate in order to sabotage humans and support the other SCPs. Repeated interactions level-up SCP-079, decreasing recharge for abilities. SCP-079 is capable of speaking to opponents through rooms with speakers, but the player's voice is overlaid with a robotic effect. SCP-079 can be defeated if all other SCPs have been defeated, the warhead goes off, or if players reset all of the Emergency Power Stations around Site-02, granting access to SCP-079's containment chamber where it can be disconnected from the system.
• SCP-096 is a tall bipedal, pale humanoid creature with long arms. Constantly weeping, SCP-096 cannot harm humans unless one looks at its face or it is shot at. This rage state will last for 15 seconds, plus 3 seconds for every other human that sees it up to a maximum of 30 seconds per rage state, in this rage state it will only be able to see the humans that have shot or seen it. SCP-096 also gains the ability to lunge large distances, break down doors, and pry open gates. After this rage state, SCP-096 will enter a cooldown state, where it is vulnerable.
• SCP-106 is an emaciated humanoid covered in a corrosive black substance. SCP-106 can walk through doorways, and can quickly teleport to a set point in the map determined by the player. SCP-106's footsteps are very distinct, and it can catch players and send them into its pocket dimension. Players stuck in the pocket dimension will have their health go down and have a randomized chance of escaping, wherein success will deposit them somewhere in the Zone they were taken from. SCP-106 can be defeated either through sustaining extensive damage, or if a player sacrifices another player using the "femur breaker" in SCP-106's containment chamber, luring SCP-106 back into containment.
• SCP-173 is a statue made of concrete. SCP-173 can only move and attack when not observed by human players. While being observed, SCP-173 can force players to blink in order to move, at a 3 second interval. SCP-173 kills instantly by snapping players' necks, and may also defecate on the floor in order to slow any opponents who should walk through the mess. SCP-173 can move large distances quickly, moving faster the lower its health is.
• SCP-939 are red, reptilian, quadrupedal creatures similar to a large canine or bear. Two SCP-939 instances, SCP-939-53 and SCP-939-89, are playable. SCP-939 have no eyes, and as such for them to detect prey, targets must either make noise or brush against them. SCP-939's heads have no neurocraniums and consist of two strong elongated jaws and attack with powerful bites. SCP-939 are capable of human speech, so SCP-939 players can deceive their opponents into opening doors.

Several anomalous objects are also found on site. These can only be accessed or utilized by human players, and are found in small storage pedestals in Light Containment and Heavy Containment.

• SCP-018 is an indestructible Wham-O Super Ball. SCP-018 bounces off objects with increasing velocity, building up speed until it releases energy in an explosion. At higher speeds, it can easily harm or even kill players, and break doors.
• SCP-207 are bottles of Coca-Cola with abnormally-high sugar and caffeine contents. Consuming the drink (SCP-207-1) provides players with increased speed and infinite stamina, but inflicts a gradual drain of health following consumption. Both the speed boost and degenerative effect can stack up to four times, with diminishing returns. This drawback can be mitigated with health items, and can only be cured with SCP-500.
• SCP-244-A and SCP-244-B are ornamental vases that, when opened or knocked over, will release a blue icy fog that hinders players’ movements, slows down and hampers manipulation of weapons and eventually drains health of both SCPs and humans.
• SCP-268 is a green tweed newsboy cap. Wearers of SCP-268 are visually and audibly imperceptible to most other players for a 15 second duration, and has a 2 minute cooldown before further use. Users of SCP-268 are not immune to damage, cannot hide from SCP-079's cameras or an enraged SCP-096, and can be located by SCP-939 through contact. Furthermore, interacting with objects or drawing a weapon will end its effects prematurely.
• SCP-330 is a steel bowl of candy labeled "take no more than two, please!!" Players may safely remove two candies from SCP-330, which depending on color can give the consumer a temporary status effects, including becoming a monster made of melted marshmallows, granting melee attacks. Attempting to take a third candy from SCP-330 will cause both of the player character's hands to become severed, leaving them unable to interact with objects or open their inventory before they bleed out. Initially added during a Hallowe'en event, it has since become a permanent addition.
• SCP-500 are rare red medicine capsules. Consumers of SCP-500 will have their health completely and instantly restored. This will also provide 12 seconds of regenerative healing, and alleviate detrimental or otherwise fatal status conditions.
• SCP-914 is a giant clockwork device that consists of a control console and two chambers on either side, one serving as an input and the other as an output. The panel has five settings: Rough, Coarse, 1:1, Fine and Very Fine. When the machine is activated, any object inside the input chamber is "refined" according to the setting the panel was set to: Rough will severely degrade items, if it doesn’t destroy them; Coarse will generally downgrade items, and will destroy already low-level ones; 1:1 will trade an item for one of equal value, or will recharge electronics such as radios; Fine will generally improve an item and will also recharge electronics; Very Fine will either greatly improve or completely destroy an item, and may recharge electronics. SCP-914 is required for progression in order to upgrade keycards, but can be used to manufacture other items or kill players who have misplaced their trust.
• SCP-1853 is a vial of translucent green liquid that, when poured on one’s body, increases their performance in competitive environment. In-game, this translates to quicker manipulation of items and increased accuracy with weapons, with the drawbacks of increased stamina consumption.
• SCP-2176 is an incandescent lightbulb with a green tinted bulb. When thrown, nearby electronics (usually lights and doors) will malfunction, causing the lights to go out and the doors to lock temporarily.
• SCP-2536 is a decorated Christmas tree playing Jingle Bells from a speaker. SCP-2536 teleports into the presence of a random player, but never twice in the same round. Presents underneath SCP-2536 when opened may provide players with items or other assistance depending on their situation. Exclusive to Christmas events.