[Floor 31]
Thus far, after escaping the Dungeon of the Floors 11 through 13, many of the environments of the Floors since had been unique, or otherwise simply the sort of place I hadn't much experience traversing.
Further than that, I would say around half of the Floors in the Tower so far contained environments I had already experienced in one form or another in the initial Tutorial Floors.
Dungeons, forests and jungles made up a good portion of it, but then there were those I had only encountered in Illusory Worlds.
Mountains, of which I had only ever climbed one―namely, the place a certain dragon tribe had declared its home.
Although that mountain was quite the trek to ascend indeed, particularly for my tremendously weak self at the time, it wasn't all that bad if compared to what climbing a real mountain would be like, I suppose in part due to necessitating the Protagonist's ability to scale and descend it numerous times.