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Level 258 is the 259th level of the Progressiverooms. It is a bare an empty field of dried and dead vegetation, the fields being somewhat tall with its plants.
The entire level is limited of its size, where large trees surround the area and when going beyond the trees will only result in you looping in the opposite direction. (Example, walking deep into the left side of the forest will result in you mysteriously moving to the right end of the forest, like a portal).
Though, there is an odd effect that happens, for every 5 explorers that enter this level, one will at least be floating and can fly, as if they could go against gravitational pull, though despite being able to fly, it is still impossible to escape the field that is surrounded as the looping of the periphery of the fields.
One way to exit this level is to find a circle of stop signs, which indicate a hatch that can be entered, which upon entering you'll see an 18 second visual of a bunch of dudes doing a weird dance. After viewing it, you'll be brought to Level 259.
Another way is to go into the bordering forests and find a tree with a lot of birds around it, this tree has a small tunnel at the base, which you'll need to crawl into. Doing so, you'll be brought to a short, dark hallway with frames of different unknown bird species. As you walk further into the tunnel, you'll notice the paintings becoming more posterized, having only two colors, mint and black. At the end of the hall is a door with a checkered texture, which upon opening yields entrance to Posterized Tunnel.
This is the visual you will observe once you go into the hatch, in which afterwards you'll be instantly sent to Level 259.
Enter the left door of the mushroom house of Level 238.
Go into a hatch surrounded by stop signs to enter Level 259.
Find a tree surrounded by birds and crawl in the tunnel underneath, then, walk down the hallway and opened the checkered door to enter Posterized Tunnel.
Dr. Doctor (Proxied by Jacob Lee)