Board Thread:Off Topic/@comment-28741271-20160330124849/@comment-7395353-20160401233446

Floor 5, which was skipped (see Floor 4), is an odd reality-shifting field which makes Floor 6 closer to Floor 4. However, going down from Floor 6 will cause you to go through a long vertical shaft of stairs to reach Floor 4.

And from the outside, Floor 5 is just a normal-sized floor.