How to escape the long room(s) on level 27, Monster Condo:

To escape that long room on the west side of the map (and
its identical-twin room in the northwest corner of the
map), you can use your fist, chainsaw, pistol, shotguns or
chaingun to attack the demon face on the wall at the north
side of the room.  This will cause the wall to rise up,
which reveals a switch that will open the room's door.

To read about or download a demo of the above walkthrough,
click here.