title: Duplicating a game scene for a secondary level?
body: <p>I’m currently working on a sprite kit - I have a first level complete. My game scene calls from encounterManager for the scenes I have prepared.</p>
  
  <p>I am curious as if it is possible to duplicate the game scene in order to set-up a secondary level? I have tried this in which the build is successful in reference to when selected ‘game scene2’ runs.</p>
  
  <p>My problem is that now I have done this as a trial the game scene appears but is completely still. I then get an error directing me to one statement in code which is as follows :</p>
  
  <pre><code>    If self.physicsBody!.velocity!.dy &gt; 300 {
      self.physicsBody!.velocity.dy = 300
      }
  </code></pre>
  
  <p>I get the error :</p>
  
  <blockquote>
    <p>Thread 1: Fatal error: unexpectedly found nil while unwrapping an optional value.</p>
  </blockquote>
  
  <p>This seemed to run fine operating at one game scene and all of a sudden has referred this error message.. </p>
  
  <p>I am fairly new to Xcode and have tried to get my head around optionals but I can’t understand how to overcome this or being able to re-tailor the statement?</p>