Floor Rearrangement

Description
"Floor Rearrangement" is a reported feature of the personalization AI that rearranges floors from Princess Peach's Castle to a whole new order, as well as having brand new ways of accessing the upper (and lower) floors.

Experiences
It is currently unknown how this phenomena is triggered, but it is theorized to start when a player starts an new game with a strong desire to reach the later floors. The most common rearranged floor is the 3rd, which has been reported to lack the endless stairs and courses such as Wing Mario Over the Rainbow. Starting on the 3rd Floor would imply that the 2nd Floor would be the new basement, and the 1st Floor being a "second basement" of sorts.

Theorizing
It is theorized that this feature was used mostly for beta testing, but left in the game to promote further exploration and progress in other players that do not own a copy yet, (or have just recently bought a copy), and saw the later floors on their friend's copy.

Further evidence that this was intended to be a scrapped feature is that this phenomena has been shown to be unstable, even going as far to trigger an Anti-Piracy Screen.