"To some extent, yes." He raises one hand, and blue light begins emanating from the portal in response. "Some of them lead across swathes of floors, others skip only two or three. There should be a number on the walls, too." Sure enough, there was a '1' scrawled in dark red on the pseudo-wooden wall.

"There is actually some sort of supposed purpose to this tower. It has the power to conjure spirit forms of people who visitors have met. One of these spectres spoke to me, and it told me that this Endless Castle is meant as a test of strength. Of that, I have no doubt - but what concerns me is what lies at its peak."

Given the army of spectres that it makes...

"In my homeland, only one person managed to make it to the top, the Demon King Oda Nobunaga. But of what he learned, he never said a word."

Typical of his personality, really. But if the Castle was here...