The FC Caverns (FCバグステージ, FC Bug Stage) are an area accessible from the hidden passageway of the Techno Condominium.
The FC Caverns is an extremely unique area among all of the worlds in this game, as it does not play out like a typical exploration-based RPG, but rather more like a movement-heavy platformer, akin to Super Mario World.
The world's aesthetic is very similar to that of the Alien Cellar, complete with the color scheme and the strange machines, but considerably glitched-up and distorted. Strange blue tears are visible in the stones of the ground, and the world is overlayed by a sweeping scanline effect along with a staticy humming. Occasionally, the cute sound effects of Urotsuki's jump will glitch out, being replaced with glitchy sound effects.
The area is split up into two separate sections. The first one is a linear platformer to the left, though there's a bit more exploration to be had: by using the Penguin and Fairy effects in tandem, the player can dive under the water here and explore the underwater caves. The second, accessible from a door in the first, is an area where Urotsuki climbs vertically, looping around the screen. Climbing to the very top will lead to a door to the Flooded Dungeon.
Almost all the effects have a different behavior in this area. While some allow Urotsuki to interact with the world in particular ways, others are purely decorative.
Effects with special interactionsEdit
|Bike||Allows Urotsuki to move faster, but jumps slightly lower than with other effects.|
|Fairy||Allows Urotsuki to float in water and to slowly elevate when in water. It also allows to fly outside of the water by repeatedly pressing the interaction key, and in addition allows Urotsuki to fit through spaces that are only one block tall.|
|Twintails||Allows Urotsuki to jump against walls by holding the interaction key, along the key corresponding to the direction of the wall.|
|Spacesuit||Can slowly float when in water and outside water by holding the interaction key.|
|Eyeball Bomb||Allows Urotsuki to return to the Nexus by holding the interaction Key. It can't be activated in water.|
|Penguin||Allows Urotsuki to swim.|
|Spring||Allows Urotsuki to jump repeatedly by holding the interaction key, with every jump being higher than the last.|
|Stretch||Allows Urotsuki to stretch while holding the interaction key. When released, Urotsuki makes a small jump.|
|Haniwa||Allows Urotsuki to quickly sink in water, but it moves slowly and jumps really low.|
|Child||Jumps lower. Just like the Fairy, can fit through one-block holes.|
|Polygon||Allows Urotsuki to create a platform by pressing the interaction key while jumping. Doing it again destroys the platform.|
|Teru Teru Bozu||Makes it rain.|
|Bat||Allows Urotsuki to fly by holding the interaction key and pressing the direction keys.|
|Insect||Allows Urotsuki to get stuck in some walls by holding the interaction key, along the key corresponding to the direction of the wall. Urotsuki jumps when the keys are released.|
|Drum||Allows Urotsuki to float in water.|
|Bunny Ears||Allows Urotsuki to jump higher and fall slowly.|
|Rainbow||Makes the water's surface walkable, after Teru Teru Bozu has been used to make it rain.|
|Cake||Urotsuki can smash the cake by hitting a ceiling.|
|Haniwa + Cake||Allows Urotsuki to quickly sink in water, but it moves slowly and jumps really low. Urotsuki is stuck looking to one side.|
|Bike + Wolf||Allows Urotsuki to move faster, but jumps slightly lower than with other effects.|
|Red Riding Hood + Teru Teru Bozu||Makes it rain.|
Effects with no special interactionsEdit
|Red Riding Hood|
|Twintails + Glasses|
The one other NPC in this area, shown in the first image of the gallery, appears to be a reference to VVVVVV, a platformer with a similar aesthetic to this area.