The Backrooms in Minecraft 1.21.11
Suffocate yourself to go to the Backrooms!
Disclaimer: This mod is still in-dev so this might not work on every setup and device.
Credits:
Enveil: Created the player worn hazmat skin.
The Backrooms: Beta Release
Explore in the Backrooms! (And don't get slaped by the monsters)
21 downloads
