I talked to the group and we came up with a few explanations. This entry is just our theory as to why Level 16 works like this. More evidence needs to be gathered before we can confirm our theory. We're marking it as Undetermined for the time being.
Recovered Image Data of Level 16.
Level 16 is the 17th Level of the Backrooms. This Level has a rapidly changing terrain, altering itself at unknown intervals. Studying this Level is difficult as its properties change with every environmental shift.
Description:
Level 16 in its current state is an arctic climate similar to those within standard reality. One notable difference is the ice covering the surrounding area has a noticeable luminous surface with high reflectivity.
The Level also has a day-night cycle with a length of approximately 13 hours to complete a full cycle. Temperatures within this Level vary from 10°C/50°F to 6°C/43°F depending on the time of day.
Entities are sparse but can be observed in this Level. Large populations of Light Guides have been seen within this space. This is a peculiar observation as these entities are quite rare, and never found in groups. Further insights into this phenomenon are unlikely as the Level is soon to alter its topography.
...The Level Key changed when the Level did. We've been here several times, it just looks completely different so we never noticed.
Bases, Communities, and Outposts:
Human life within this Level is unsustainable due to the unstable nature of this Level. No long-term bases can form within Level 16 for this reason.
Don't stay here when the environment shifts. Glaciers jutted out of the ground, soaring high into the sky. Rivers suddenly began to gush out of boulders. The landscape began to freeze over, causing the air to chill. Small orbs began to surround us, almost as a warning. If you aren't careful, you can become encased within the changing terrain.
I made it out with only frostbite and a few scrapes. Others weren't so lucky.
Entrances And Exits:
Entrances
Finding and touching an orange gallium patch in Level 75 will bring you here. There have been several other supposed entrances, but this is the only confirmed one as of the time of writing.
Exits
The location of the exit is different with each alteration, but the destination is constant. In the Level's current state, finding and standing on a sheet of ice covered in sand will lead you to Level 46.
NOTICE:
Once the current state of Level 16 has changed, the former documentation is to be archived to prevent confusion as to the active terrain. Information in archived entries may no longer contain accurate descriptions and should not be used in survival circumstances.
Wish we knew that before entering. Walked into a rainforest, walked out of a tundra.