My answer is:
None. They're all exits. I mean, does anyone _want_ to go in there? And once you're there, do you want to hang around?
splitting hairs semantically, maybe...
: Ask and ye shall receive. ;) I'll join the threadjacking club, to point out
: that if you can't play the game, you can still try to figure out Hamish's
: clue : How many entrances are there to The Labyrinth?
: That's an easy one: Pfhor! I mean, four.
: While the Labyrinth has plenty of mysteries , the entrances are about the
: least mysterious thing about it. Four ladders, one in each corner, are the
: only ways in or out. The walkthrough even lists them out, and shows you
: a nice map too. The biggest mystery, it seems, is finding the mystery:
: what can be special about these four entrances?