Backrooms
This datapack is currently in active development and adds several new dimensions to Minecraft, each representing one of the famous Backrooms levels. I originally created this project for playing with friends on our server, so it doesn't claim to be fully accurate to the canonical lore.
Upon your first death, your character enters the Backrooms. All items from the regular world remain in your inventory, but currently there's no way to return back.
If you explore level 0 for a sufficient amount of time, you might discover a room made of white terracotta that will transport you to level 1. On level 1, there's a structure made of white concrete that allows you to return to level 0 or move to level 2 instead.
I plan to add more levels in the future, but I don't intend to populate these dimensions with mobs.
Important: Generating new dimensions can take significant time. If the game freezes, just wait patiently - the loading should complete after some time.