One of the more annoying levels in the game as large sections of it are nondescript maze set with spike traps, so don't be ashamed to use the automap. First, head for the pentagram area. Use the pull chain on the outer rim of the area before you drop in after the pentagram, to make sure you don't get stuck down there.
From there, you can head to the east side to find the exit inside the maze. The keys are optional.
