A Paper 26.2 plugin that generates an infinite, procedurally generated Backrooms world: a grid of 6×6-block cells with solid corner pillars (Potent Sulfur) and sides that are permanently either open or walled off — random, but always consistent, no matter which direction you approach from. Floor of Stripped Birch Wood, ceiling of Beehive with Ochre Froglights at the four inner corners of each cell, 4 blocks of ceiling height.
The only additional plugin required is Multiverse-Core (version 5.7.0 or newer) — it's used to create the world and handle teleportation. Optional, but not necessary: Multiverse-Portals (for a walkable portal instead of a command) and Multiverse-NetherPortals (if you want to restrict Nether/End portals leading out of the world).
Usage: drop both jars into the plugins folder, restart the server, then run /mv create backrooms normal -g BackroomsGenerator to create the world and /mv tp backrooms to teleport in. Recommended afterward: /mv modify set difficulty peaceful backrooms, plus setting the doWeatherCycle and doDaylightCycle gamerules to false.
