anchor.diff:    // Game state
     int _numFrames = 0;
     bool _isGameOver = false;
  +  int _gameOverFrame;
     int _currentLevel = 0;
   
     // Heads up display
  
positive.code:     if (_numFrames > _numFramesShieldActive) _shield.visible = false;
      else if (_numFrames > _numFramesShieldActive - _numFramesShieldFlickers) _shield.visible = !_shield.visible;
  
      _numFrames++;
    }
  
  
negative.code: 
      // Set game over
      _isGameOver = true;
      _gameOverFrame = _numFrames;
      _gameOverCallback(_hud.score);
  
      // Remove the ship
  