Level by Paal Olstad.

You start here.

This is a fast an furious level where you have lots of options for moving. Enemies will come at you unexpecedly from evey direction. Find the revolver and the axe behind secret doors near the start. These are the only weapons you will get on this level. Be prepared to switch quickly between them. Find health chalices in several places.

Get the brass key behind this secret door.

Find the bronze key in this room.

Find the silver key in this room and the iron key behind the secret door (you may have noticed it past the door by the wooden barrel).

Continue.