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Level 3999 is the 4000th level of the Backrooms and is quite possibly the final level in the Backrooms, as it is at the end of Cluster IV ([[1]]).

An image of Level 3999.

Survival Difficulty: Class 0

Safe

Secure

Devoid of Entities

Description

Level 3999 is an arcade level with a size of 10,000,000,000 mi². Most of the arcade's games are well-known such as Pac-Man, Mario and Donkey Kong. There are other games such as Ms. Pacman, Double Dragon and Lunar Lander. To add, there has been an unconfirmed sighting of Polybius.

The level consists of 3999-1, 3999-2 and 3999-3. -3 is advised not to go to as the area is filled with toxic gas and high levels of Uranium, the only level to feature Uranium. If you are careful enough however, you can come across Neon Water.

The level is mostly safe, however very difficult to enter as you have to go through a specific wall in Level 11 to get there.

Noclipping out leads you to Level 561.

Colonies and Outposts

Singularity Point Base 1:

Singularity Point's main base contains 30 inhabitants. Their goal here is to help travelers get to the exit.

Backroom Colonists

The Backroom Colonists have an outpost that is around a 19 minute walk from the beginning point directly south, and at the base, they have set up a few cafes for people to relax, and an area where you can trade.

Oasis Cara (OFSEB)

Accommodates wanderers and guides them to the exit. Based on Level 3999.

Population: 9,000

Supplies: Surplus

Willing to Trade: Yes

The OFSEB's end goal is to escort wanderers to this base so that they can leave.

Entrances And Exits

Entrances

  • Heading through a purple glitched wall in Level 11.
  • This level can also be entered through Level 153 and Level 1207.
  • Another way to this level is through the rainbow slides in Level 806.
  • There is also a high chance of ending up here after exiting Level 3998.
  • Going through Door 1 in Level 561 leads to this level.
  • Another way to enter is by exiting Detention.
  • If the subway in Level 1275 is boarded, it will lead to this level.
  • You can enter by going through the “Exit” Portal in Level 382.
  • Noclip into yourself. Even Works in The void.

Exits

Walking north for 3 minutes will lead to the Singularity Point Base. Ask a member to guide you north. If you see glass doors, that is your escape. If not, you need to keep walking north. This exit will always take you back to the Frontrooms. Another way to exit is to find a very rare machine with Minecraft running on it. If it is played for around an hour, one will be transported to Level 1248. Noclipping out leads you to Level 561. Playing Terraria in this level finding a Computer with the game on it for 4 Hours will take you to Level 4382

Playing a Copy of Spore or Stellaris on any PC for more then 30 Minutes will teleport you to Level 949

Finding a PS4 console with DOOM (2016) installed on it and playing it for 30 minutes will send you to The UAC.

Finding an arcade machine playing the old pixel game "Crossbow" and finishing one scenario will lead you to Level 2133

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