Developed by Sniper1_1. Feel free to use, but please give credit.
Datapack contains several liminal spaces-inspired dimensions. A few have unique ways of entering/exiting, all can be entered via portals that spawn in each dimension. These portal cycle every minute to randomly link to another dimension. Will you get lucky and find one at the right time to get out?
Backrooms
Based on the classic yellowish rooms.
Pillarrooms
Like the Backrooms, but more open.
Apartments
An infinite series of apartment-like complexes under a strange sky.
Croplands
Infinite wheat field.
Amplified
It's as if you created an amplified world.
Concrete
An artificial landscape built with concrete.
Debug
The hidden debug world preset with all blocks and their states.
Floating Jungle Islands
Tropical islands floating in an infinite ocean.
Floating Mushroom Islands
Mushroom field islands floating in the sky.
Large Biomes
It's as if you created a large biomes world.
Overtwo
An identical copy of the overworld. Need I say more?
Poolrooms
Based on the classic infinite pool-related rooms.
Sculk
Essentially an infinite Deep Dark. Reach the surface to escape.
Online pack generator resources: Misode. Worldgen related info: WafflesAreBetter, slicedlime, and the MC Wiki.