diff --git a/World.java b/World.java
index 2318bec..b5d3f1a 100644
--- a/World.java
+++ b/World.java
@@ -6,6 +6,7 @@ class World implements Drawable
     private static final int DISTANCE = 250;
     private static final int START_SPEED = 150;
     private static final int ACCELERATION = 2;
+    private static final int GAP_SIZE = 100;
 
     private final ArrayList<Rectangle> _obstacles;
     private String _obstacleColor;
@@ -42,9 +43,10 @@ class World implements Drawable
 
     private void createObstacle(int x)
     {
-        int gap = _random.nextInt(TurtleWelt.HEIGHT - 200) + 50;
+        // Position gap somewhere between 50px and HEIGHT - 50px
+        int gap = _random.nextInt(TurtleWelt.HEIGHT - GAP_SIZE - 100) + 50;
         _obstacles.add(new Rectangle(x, 0, 30, gap, _obstacleColor, false));
-        _obstacles.add(new Rectangle(x, gap + 100, 30, TurtleWelt.HEIGHT, _obstacleColor, false));
+        _obstacles.add(new Rectangle(x, gap + GAP_SIZE, 30, TurtleWelt.HEIGHT, _obstacleColor, false));
     }
 
     public void update(double elapsed)