I don't have keys or even a particular concept. I guess this dungeon was built by creatures who just LOVE stairs. So, this isn't a great fit for Barsoom (where they use ramps instead of stairs).
Or for certain areas of Jane Gaskell's The Serpent:
'Now we should like to see our rooms,' Zerd said.The governor led him over to the staircase - the more menial of us followed closely, the rest trailed behind or simply didn't bother - and the governor stood aside to let his guests precede him. I ran up, two steps at a time, and only when I was at the top did I realise that everyone else was still at the bottom.They all stood quiet, with upturned faces, then gasped.'What's the matter?' I said, feeling appallingly self-conscious alone at the top there. T'm sorry, I thought we were supposed to come up here - ' and I began to descend again, feeling the blushes rising up my throat and scorching my cheeks.'How do you do it?' 'Where did you learn?' said several voices.'Learn what?' I asked, most embarrassed.'She ran up, two at a time,' said someone.I was now at the bottom and a crowd of winegirls ran forward cheering me, and Isad came up, dripping wet, hooting on his pet horn. Lara looked sour.'Do it again, do it again!' cried the winegirls to me.'What is it?' I said.'You're so fast, could you do it again just as fast?''Of course, my country is full of stairs. Our houses are often four-storeyed - aren't yours?''No,' Zerd said. 'We don't have stairs in the North. Do it again, Cija, it's fascinating to watch.'So I ran up and down the stairs for them twice more, and they cheered me and chanted compliments, and at last all trooped up after me.
This version has the relative depth of areas: