Yume 2kki:Shadowy Caves

The Shadowy Caves (虚騒, kyuusou, literal meaning unclear. Seems to translate to "noisy fissure") is an area accessible from a few areas in the Dream Park, most notably the blue fabric south of the entrance to the wooden maze building.

Features

The Shadowy Caves is dark and noisy, filled with interesting variants on the main Chasers that are modeled in wireframe. Despite this fact, it is remarkably large and open. It is littered with dead Puni as well piles of the balls and sticks that make up your foes here.

At the center of the main cave is a large pillar with four switches on it, that seems to require a passcode of sorts, and in addition, there are several rooms, all hidden in some way as well as requiring entrance by chainsawing a wireframe chaser disguised as a cone, that are all shaped like a number and contain an inordinate amount of Puni. If the player has visited this area at least twice, using the Glasses effect will allow the player to see arrows above each switch, that each points in the direction of one of these rooms, indicating the passcode. Each number room is hidden as follows, in order from left to right:

The arrows, each pointing in the direction of one of the number rooms.

The 5 room is directly south of the passcode device, hidden behind a wireframe of the Robot Guard. In addition, to access its entrance, one must chainsaw another wireframe disguised as a cone to reach the southernmost part of the cave.
The 7 room is northwest of the passcode device. It is accessible by using the fairy effect to fly up to a ladder that is barely out of sight. Notably, it is also home to one of the Five Guardians.
The 3 room, directly west of the passcode device, is hidden behind another Robot Guard wireframe.
The 9 room is found on the southeast of the cave. Much like the 5 and 3 rooms it lies behind a Robot Guard, however the door is actually on the bottom wall, and the Robot Guard wireframe faces up. As a result the orientation of the entire room is flipped, diverting the player to believe it indicates a 6.

As a result of the arrows, one can work out that the passcode is 5739.