--- a/data/levels/level1	Wed Sep 04 16:56:24 2013 +0200
+++ b/data/levels/level1	Wed Sep 04 17:25:26 2013 +0200
@@ -50,8 +50,16 @@
   - [290, 160]
   - Run around, press some buttons, have fun!
   classname: Note
+- args:
+  - [800, 680]
+  - [900, 680]
+  - door_switch
+  classname: Bulkhead
+  name: switch_bulkhead
 lines:
 - - [750, 680]
+  - [800, 680]
+- - [900, 680]
   - [950, 680]
 - - [750, 480]
   - [950, 480]

--- a/nagslang/game_object.py	Wed Sep 04 16:56:24 2013 +0200
+++ b/nagslang/game_object.py	Wed Sep 04 17:25:26 2013 +0200
@@ -220,3 +220,27 @@
     def collide_with_protagonist(self):
         if self.puzzler.get_state():
             DoorEvent.post(self.destination, self.dest_pos)
+
+
+class Bulkhead(GameObject):
+    zorder = ZORDER_FLOOR
+
+    def __init__(self, space, end1, end2, key_state=None):
+        body = make_body(None, None, (0, 0))
+        self.shape = pymunk.Segment(body, tuple(end1), tuple(end2), 3)
+        self.shape.collision_type = COLLISION_TYPE_DOOR
+        if key_state is None:
+            puzzler = puzzle.YesPuzzler()
+        else:
+            puzzler = puzzle.StateProxyPuzzler(key_state)
+        super(Bulkhead, self).__init__(
+            SingleShapePhysicser(space, self.shape),
+            render.ShapeStateRenderer(),
+            puzzler,
+        )
+
+    def collide_with_protagonist(self):
+        if self.puzzler.get_state():
+            # Reject the collision, we can walk through.
+            return False
+        return True