Floor 4*:  The Orient
*(earlier is better for this one, I think)

The land is divided by two countries:  In the east, the Celestial Shogunate; and in the west, the Heavenly Empire.  A large mountain range divides the nations—and contains two dungeons:  The Top of the World; and the Deep Naraka.  An ocean surrounds the land, offering an easier route for traders to go between the two nations.

In the West:
Qigong
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The capital city of the Heavenly Empire, Qigong lies at the heart of the land.  Characterized by majestic structures reaching into the sky, the capital is a beautiful city.  The streets are paved and well-maintained; countless shops offer the nation’s wares; and the Palace rising in the very center is home to the Heavenly Emperor himself.  Also, the portal gate is here.
Surrounding the capital proper is the less affluent residential zone.  Small, single-story homes fan out for better than a mile.  Beyond those are endless rows of farms, broken only by the occasional, large, community hut rising from the mire.  The distinction between rich and poor is, as has been the case throughout history, enormous.
As a culture, the people of the Heavenly Empire value song and drama.  Skilled singers and actors are sought after, and those with the clearest voices have the greatest prestige.

Frozen Naraka
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Beneath the Heavenly Empire is another land, a frozen wasteland filled with demons and curses.


In the East:
Edo
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The city of Edo is geographically enormous.  The buildings rarely stand higher than two stories, and through most of the city they are spread out to allow space for yards and gardens.  The only exception is the dock area, where most of the trading occurs.  Here the shops and warehouses are built close together—but that isn’t a concern, as only the eccentric would live there.  The people of the Celestial Shogunate value nature and the natural spirits greatly, and verdant life can be seen throughout all their cities and villages.
They also value performers who can blend with nature, be it through instruments or the dance.  Vocal performance isn’t as sought after, as speech is seen as a disruption of the natural song; but those able to dance with the reeds or harmonize with the winds are praised and respected.

Burning Naraka
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Beneath the lands of the Edo lies this world consumed in flame.  Distinctly demonic creatures attempt to consume anyone foolish enough to enter their domain—and they don’t mind eating their food extra-crispy.


In the Mountains:
Deep Naraka
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When you reach the center mountains, you can choose to go up or down.  When you go down, you enter the Deep Naraka, a lightless place haunted by incorporeals.  Going in without several sources of light would surely end in failure and death.  Similarly, not being prepared to deal with the restless souls haunting its halls would bring your downfall.

Floor Dungeon – The Top of the World
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If you choose to go up, you will find the Floor Dungeon.  This dungeon is remarkably straightforward:  players will go through a series of tests to prove they are fit to ascend to the next floor.  It demands more than brute force from a party—although the final test at the end will demand a lot of that.  Much of this dungeon will require players to think and skill their way through.