The Backrooms [1.16.5] [1.15.2]

The Backrooms mod adds a dimension with infinite rooms.

Secret rooms in the dimension come in difficulty levels 0, 1, 2, and 3. Each room is a labyrinth of rooms, with many deadly traps and unpleasant surprises, from which it is not so easy to get out alive. When heading to the Backrooms, it’s best to be prepared and stock up on food, as the only source of food is rotten flesh.

You will also need a weapon, and if for some reason you forgot it, your only choice is to pray. Each level includes background soundtracks that inspire fear and force the player to completely immerse themselves in an atmosphere of hopelessness.