Daa'argararath's Dungeon of Deathtrap Doorways!

Publisher's blurb:

You hug the wall of the thin cliff, praying that the quartet of Dark Walkers below you don't look up. One Dark Walker is bad enough, but four? How did you get in this mess?

You creep along the side of the wall, doing your best not to make any noise. You keep your eyes on your pursuers, feeling the way with your hand. After a few painfully slow inches of creeping, your hand lands on something wooden, not rock. You slowly move your gaze from the Dark Walkers to the door you've just found. A door? Who puts a door in the middle of a cliff half way up a mountain of rock? At this point you really don't care, as long as it opens.