--- a/nagslang/enemies.py	Wed Sep 04 19:11:00 2013 +0200
+++ b/nagslang/enemies.py	Wed Sep 04 21:16:09 2013 +0200
@@ -10,6 +10,15 @@
 from nagslang.resources import resources
 
 
+def get_editable_enemies():
+    classes = []
+    for cls_name, cls in globals().iteritems():
+        if isinstance(cls, type) and issubclass(cls, Enemy):
+            if hasattr(cls, 'requires'):
+                classes.append((cls_name, cls))
+    return classes
+
+
 class Enemy(GameObject):
     """A base class for mobile enemies"""
 
@@ -33,6 +42,10 @@
     def attack(self):
         raise NotImplementedError
 
+    @classmethod
+    def requires(cls):
+        return [("name", "string"), ("position", "coordinates")]
+
 
 class PatrollingAlien(Enemy):
     is_moving = True  # Always walking.
@@ -112,3 +125,8 @@
             self._switch_direction()
         self.set_direction(x_step, y_step)
         super(PatrollingAlien, self).animate()
+
+    @classmethod
+    def requires(cls):
+        return [("name", "string"), ("position", "coordinates"),
+                ("end_position", "coordinates")]

--- a/nagslang/game_object.py	Wed Sep 04 19:11:00 2013 +0200
+++ b/nagslang/game_object.py	Wed Sep 04 21:16:09 2013 +0200
@@ -10,6 +10,14 @@
 from nagslang.events import DoorEvent
 
 
+def get_editable_game_objects():
+    classes = []
+    for cls_name, cls in globals().iteritems():
+        if isinstance(cls, type) and hasattr(cls, 'requires'):
+            classes.append((cls_name, cls))
+    return classes
+
+
 class Physicser(object):
     def __init__(self, space):
         self._space = space
@@ -136,6 +144,11 @@
         """
         return True
 
+    @classmethod
+    def requires(cls):
+        """Hints for the level editor"""
+        return [("name", "string")]
+
 
 class FloorSwitch(GameObject):
     zorder = ZORDER_FLOOR
@@ -154,6 +167,10 @@
             puzzle.CollidePuzzler(*SWITCH_PUSHERS),
         )
 
+    @classmethod
+    def requires(cls):
+        return [("name", "string"), ("position", "coordinates")]
+
 
 class Note(GameObject):
     zorder = ZORDER_FLOOR
@@ -169,6 +186,11 @@
             render.TextOverlay(message),
         )
 
+    @classmethod
+    def requires(cls):
+        return [("name", "string"), ("position", "coordinates"),
+                ("message", "text")]
+
 
 class FloorLight(GameObject):
     zorder = ZORDER_FLOOR
@@ -187,6 +209,11 @@
             puzzle.StateProxyPuzzler(state_source),
         )
 
+    @classmethod
+    def requires(cls):
+        return [("name", "string"), ("position", "coordinates"),
+                ("state_source", "puzzler")]
+
 
 class Box(GameObject):
     def __init__(self, space, position):
@@ -200,6 +227,11 @@
             render.ImageRenderer(resources.get_image('objects', 'crate.png')),
         )
 
+    @classmethod
+    def requires(cls):
+        return [("name", "string"), ("position", "coordinates"),
+                ("state_source", "puzzler")]
+
 
 class Door(GameObject):
     zorder = ZORDER_FLOOR
@@ -226,6 +258,12 @@
         if self.puzzler.get_state():
             DoorEvent.post(self.destination, self.dest_pos)
 
+    @classmethod
+    def requires(cls):
+        return [("name", "string"), ("position", "coordinates"),
+                ("destination", "level name"), ("dest_pos", "coordinate"),
+                ("key_state", "puzzler")]
+
 
 class Bulkhead(GameObject):
     zorder = ZORDER_FLOOR
@@ -249,3 +287,8 @@
             # Reject the collision, we can walk through.
             return False
         return True
+
+    @classmethod
+    def requires(cls):
+        return [("name", "string"), ("end1", "coordinates"),
+                ("end2", "coordinates"), ("key_state", "puzzler")]

--- a/nagslang/puzzle.py	Wed Sep 04 19:11:00 2013 +0200
+++ b/nagslang/puzzle.py	Wed Sep 04 21:16:09 2013 +0200
@@ -1,6 +1,14 @@
 from nagslang.constants import COLLISION_TYPE_PLAYER
 
 
+def get_editable_puzzlers():
+    classes = []
+    for cls_name, cls in globals().iteritems():
+        if isinstance(cls, type) and hasattr(cls, 'requires'):
+            classes.append((cls_name, cls))
+    return classes
+
+
 class PuzzleGlue(object):
     """Glue that holds bits of a puzzle together.
     """
@@ -29,6 +37,13 @@
     def get_state(self):
         raise NotImplementedError()
 
+    @classmethod
+    def requires(cls):
+        """Tell the level editor the arguments we require
+
+           Format is a list of name: type hint tuples"""
+        return [("name", "string")]
+
 
 class YesPuzzler(Puzzler):
     """Yes sir, I'm always on.
@@ -57,6 +72,10 @@
                 return True
         return False
 
+    @classmethod
+    def requires(cls):
+        return [("name", "string"), ("collision_types", "list of ints")]
+
 
 class StateProxyPuzzler(Puzzler):
     def __init__(self, state_source):
@@ -65,6 +84,10 @@
     def get_state(self):
         return self.glue.get_state_of(self._state_source)
 
+    @classmethod
+    def requires(cls):
+        return [("name", "string"), ("sources", "list of names")]
+
 
 class StateLogicalAndPuzzler(Puzzler):
     def __init__(self, *state_sources):
@@ -75,3 +98,7 @@
             if not self.glue.get_state_of(state_source):
                 return False
         return True
+
+    @classmethod
+    def requires(cls):
+        return [("name", "string"), ("sources", "list of names")]