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Yume 2kki:3D Underworld

3D Underworld
3d underworld.png
Basic Info
Original Name(s)

FC Labyrinth
FC Bug Stage: Red Maze Area



Events None
Notable NPCs None
Connecting Areas

Kaleidoscope World
Streetlight Docks
Critter Village
Marshmallow Shallows NoEntry

Removed Connections

Oblique Hell

BGM 2_30
Map ID 1885
Map Type Large, Non-looping,  Platformer
Version Added 0.120d patch 10
Last Updated 0.122g
Author qxy

3D Underworld is an area accessible through the cone house with the faucet in Marshmallow Shallows.


This area is a distinctive variation of FC Caverns that connects to several areas. Though it shares the identical platforming movements of FC Caverns, 3D Underworld's structure has more of the same isometric, three-dimensional style of Oblique Hell, and also features the obstacle of red walls which periodically slide open and shut. The Fairy effect is recommended to navigate and reach the other connections in this area.

From Marshmallow Shallows, the player will fall through a couple of screens, some of which have platforms leading to other areas. After falling to the bottom and passing through a moving platform, you can find a door with a dark blue, scrolling parallax background that leads to Critter Village.

By going slightly north of where you had initially landed, taking the west platform will lead to a short hallway with moving blocks, ending in a round portal with a colorful exit, leading to Kaleidoscope World. You can also choose to go north from here and reach another portal with a pale light shining over a black ocean, leading to Streetlight Docks.


If you have visited Red Sewers at least once and have the Cake effect:

With the Marginal and Cake effect, after visiting the Red Sewers and the balcony in Guts World at least once and unlocking the connection from Broken Faces Area to Dream Park:


  • Viewing this map in RPGMaker will reveal that this map's layout is identical to Oblique Hell, though flipped upside down.
  • Additionally, this map features collectable coins when viewed in RPGmaker, though as of current, they are inaccessible. These same coins can also be found when viewing FC Caverns C.
  • The background of the doorway leading to Critter Village is similar to that of Bubble World.
    • Prior to version 0.122g, said doorway lead to a vertically looping subarea of 3D Underworld known as the Glitch Nexus.
  • Prior to version 0.122g, this area featured a fixed camera.
  • An issue while playing on EasyRPG can cause the camera to shake while moving around.