Wonderland - Jags

A strange, thriving greenery has begun to overtake some areas. This is
a fantastic, fantasy forest by turns artistic, beautiful, nightmarish, and
fanciful. Within the deeper woods there are actually towns and hamlets
and in some cases the woods surround more stubborn structures that
exist from the upper levels.
The wood can begin appearing on any level of the world (the first 10
stories of a skyscraper might be glass, steel, and stone—but if you take
one of the few working elevators to the 11 th you might see the hallways
moving away dissolve into fields and trees and ponds.
Floating Islands
There are vast “sky-scapes” -- archipelagos of floating islands of rock
and greenery that hover over cloud-filled depths. There is still a “down”
here—gravity pulls man and beast, but wood cut from trees on the
floating islands will, itself, float and bob at the level (depth?) from which
it was cut.
Those unfortunate enough to fall off the edge of the world tumble for
days at least; maybe weeks. Legend on Chessboard Three has it that the
fall lasts forever, but there is some evidence that the depths end in deeper
levels of reality (Chessboards Five and Six) and that at least some of
those who fall arrive unhurt.
Road Networks
Although it doesn’t make much sense, both hard-top superhighways
(with reflective signs and mile markers, some with imaginary numbers,
and the like) and railroads crisscross the Chessboard Three world.
Exactly how these got built is a mystery but they do exist and seem, in
some cases, to be paths to upper or lower levels of reality.
Society
The population on Chessboard Three is very low—and the Shadow
population is almost non-existent. You may find a Shadow of someone
wandering one of the crazy hallways of some structure they inhabit in
reality but the Shadow, down here, will seem like a sleepwalker and your
encounter with it will, on Chessboard Zero will usually result only in
them thinking about you (if you are on Chessboard Three, chances are,
your Reflection is Disassociated).
The population gap is filled in by a variety of Feudal Societies who
live under a loose-knit hierarchy of semi-royalty. The exact nature of
this society is mysterious (and there’s further detail in the GM’s book!)
but there are non-human knights errant, castles built out of the roofs of
twisted skyscrapers, and monsters lurking under raised walkways that
have become “bridges.”
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Deeper Mysteries - Chessboards