The last door on the third floor is entirely red apart from the door handle and keycard slot, showing no pattern unlike the other wooden doors. Attempting to open the door simply reads "Locked.", unless you have the Gemini card, upon which the door will read "You used the Gemini card."
Upon entering the Gemini room, the music changes to "room_yourfault", and your player sprite is replaced with a greyscale version that is missing its face. The room is a long, winding road that shares its aesthetic with OFF's Zone 0. Jelly objects that appear to be keyboards wander around the room, and attempting to talk with them will return a blank dialogue box. At the end of the road is a throne with what appears to be a foetus on it. Approaching it will enter an un-winnable battle which does not change the music.
<Information about boss required here>.