Aquatic Cube City

Aquatic Cube City (石切, Ishikiri, Stone-cut) is an area accessible from the staircase in Ocean Subsurface.

Features
Aquatic Cube City is a looping, underwater environment consisting of isometrically-stacked cubes, with traffic lights along the way, where going to the edges of each cube will make Urotsuki fall off. However, with the Penguin or Spacesuit effects, Urotsuki can travel the area freely.

Going eastward from the entrance, there are three phone booths, where making a call with any of them will take you to Urotsuki's Dream Apartments, enabling the telephone there to take you to this area. Further south of the phone booths is a passageway to a bathroom, where interacting with the elevated tile will reveal a trapdoor to the kitchen. West of the kitchen is the clothes room and the exit, and east is Firehead's bedroom, where there is a chance that as you enter, Firehead is sleeping, with her clothes placed on the bed. If she isn't around, using the Bunny Ears effect will reveal a rabbit plush on her bed, whose color depends on the color of the ears being worn. By sleeping here, there is a chance that you can hear mixing sounds, and waking up from here will reveal that the lights are off. Heading to the kitchen at this time shows that a tall silhouette is cooking something, and going to the clothes room reveals that the exit is closed. From here, going back to sleep after roaming around for some time will lead to Surgical Scissors World.

If you have entered any part of Firehead's house at least once at any point during your visit here, heading over to one of the sections with two traffic lights south of the bathroom's entrance will let Firehead appear, dancing as disco lights flash, with dance music playing, so long as you are in that section.

Directions
Nexus → Marijuana Goddess World → Dark Room → Snowy Forest → Techno Condominium → Cotton Candy Haven → Infinite Library → Erratic Pillar Lands → Ocean Subsurface → Aquatic Cube City

Nexus → Urotsuki's Dream Apartments → Aquatic Cube City (after using the phone here)