diff --git a/README.md b/README.md
index a2daf3a..dbaeaf2 100644
--- a/README.md
+++ b/README.md
@@ -23,26 +23,30 @@ A game about a journey involving vehicles and obstacles.
   * Car engine
   * Wheel rolling
   * Wheel slips
-* Camera
+* Graphics
+  * themeless
   * 3rd person view (following the player)
+  * depth-of-field filter
+  * distance-based hiding of objects
 * Input
   * Keyboard
   * Game menu
 
 ### TODO
 #### Stage 0 :: Prototype
-* done
+* DONE
 
 #### Stage 1 :: Core Game
 * Joystick controls
 * FPV camera
 * Main Menu
 * Winning condition (location)
+* Loading screen
 * Health indicator
-* Persistent content on terrain blocks
 * NPC AI
+* Enemy objects - mines
 * Enemy NPCs - punching, shooting
-* Interacting with the environment
+* Interacting with the environment - opening of gates
 
 #### Stage 2 :: Filled Game
 * Roadblocks
@@ -50,8 +54,11 @@ A game about a journey involving vehicles and obstacles.
 * Car models
 * Scenery models
 * Intro, Outro
+* Dialogs
+* Fuel
 
 #### Stage 3 :: Overflowing Game
 * Stealth
 * Clothing
 * Car customization
+* Destructable environment
diff --git a/screenshot.png b/screenshot.png
index 63ea5d7..9f9d1c3 100644
Binary files a/screenshot.png and b/screenshot.png differ
diff --git a/src/roadtrip/model/ProceduralMapQuadBlock.java b/src/roadtrip/model/ProceduralMapQuadBlock.java
index 65053f4..2480258 100644
--- a/src/roadtrip/model/ProceduralMapQuadBlock.java
+++ b/src/roadtrip/model/ProceduralMapQuadBlock.java
@@ -44,13 +44,35 @@ public class ProceduralMapQuadBlock extends AbstractProceduralBlock
 			float height = terrainQuad.getHeight(pos);
                         String type;
                         if (quadRand.nextInt(10) == 0) {
-                            type = "house";
+                            type = "rock";
                         } else {
                             type = "tree";
                         }
 			Vector3f location = new Vector3f(pos.x, height, pos.y);
 			mapObjects.add(new MapObjectInstance(type, location));
 		}
+                
+                // walls
+                if (quadRand.nextInt(3) == 0) {
+                    int dir = quadRand.nextInt(4);
+                    for (int i = 0; i < quadRand.nextInt(terrainQuad.getPatchSize() * (10 + quadRand.nextInt(100))); i++) {
+                            Vector2f pos;
+                            if (prevPos == null || quadRand.nextFloat() < 0.1f) {
+                                    pos = new Vector2f((quadRand.nextFloat() - 0.5f) * cellSize, (quadRand.nextFloat() - 0.5f) * cellSize)
+						.addLocal(quadPos);
+                            } else {
+                                    if (quadRand.nextInt(10) == 0) {
+                                        dir = (dir + quadRand.nextInt(2) * 2 - 1) % 4;
+                                    }
+                                    pos = new Vector2f(dir == 1 ? 1 : (dir == 3 ? -1 : 0), dir == 0 ? 1 : (dir == 2 ? -1 : 0)).addLocal(prevPos);
+                            }
+                            prevPos = pos;
+                            float height = terrainQuad.getHeight(pos);
+                            String type = "wall";
+                            Vector3f location = new Vector3f(pos.x, height, pos.y);
+                            mapObjects.add(new MapObjectInstance(type, location));
+                    }
+                }
 	}
 
 	public Iterable<? extends MapObjectInstance> getMapObjects()
diff --git a/src/roadtrip/view/GameWorldView.java b/src/roadtrip/view/GameWorldView.java
index 40fdd18..628582f 100644
--- a/src/roadtrip/view/GameWorldView.java
+++ b/src/roadtrip/view/GameWorldView.java
@@ -182,6 +182,7 @@ public class GameWorldView {
         terrain.terrainGrid.addControl(lodControl);
         
         final Node treeModel = createTree();
+        final Node blockModel = createBlock();
         final Node rockModel = createRock();
         
         final FineTerrainGrid terrainGrid = terrain.terrainGrid;
@@ -238,12 +239,19 @@ public class GameWorldView {
                             boxHalf = new Vector3f(s * 0.2f, s * 3f, s * 0.2f);
                             modelPhysics = new RigidBodyControl(new BoxCollisionShape(boxHalf), 0f);
                             break;
-                        /*case "house":
-                            modelInstance = houseModel.clone();
-                            boxHalf = new Vector3f(2f + rand.nextFloat() * 10f, 2f + rand.nextFloat() * 10f, 2f + rand.nextFloat() * 10f);
-                            scale = boxHalf;
+                        case "rock":
+                            modelInstance = blockModel.clone();
+                            boxHalf = new Vector3f(0.5f, 0.5f, 0.5f);
+                            pos.y += 0.2f;
                             modelPhysics = new RigidBodyControl(new BoxCollisionShape(boxHalf), 0f);
-                            break;*/
+                            break;
+                        case "wall":
+                            modelInstance = blockModel.clone();
+                            scale = new Vector3f(1f, 2f, 1f);
+                            boxHalf = new Vector3f(0.5f, 1f, 0.5f);
+                            pos.y += 0.5f;
+                            modelPhysics = new RigidBodyControl(new BoxCollisionShape(boxHalf), 0f);
+                            break;
                         default:
                             throw new RuntimeException("Unhandled object type: " + mapObject.getType());
                     }
@@ -362,5 +370,19 @@ public class GameWorldView {
         
         return rockModel;
     }
+    
+    private Node createBlock() {
+        Material rockMat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
+        rockMat.setColor("Color",  ColorRGBA.Gray);
+        rockMat.getAdditionalRenderState().setWireframe(true);
+        
+        Geometry rockGeom = new Geometry("rock", new Box(0.5f, 0.5f, 0.5f));
+        rockGeom.setMaterial(rockMat);
+        
+        Node rockModel = new Node("rockNode");
+        rockModel.attachChild(rockGeom);
+        
+        return rockModel;
+    }
 
 }