Floor cucking

Floor cucking is a phenomenon that occurs when 2 floors or 2 ceilings (both need not be floors, despite the name) are prioritized unintuitively. Triangles are prioritized by the height of their first vertex. This means that, for example, 2 floors can overlap each other, with the first being on average much higher than the second; however, if the first vertex of the second floor is higher than the first vertex of the first floor, the game will decide that the second floor is higher. This can cause significant in-game glitches. For example, if a ceiling is wedged between 2 floors, and the lower floor cucks the higher one, the area above the ceiling triangle becomes a ceiling and Mario will not be able to enter it despite the floor above the ceiling.