title: How to stop gamemaker object from leaving tracer
body: <p>I have just started to use gamemaker and have made my first very basic game, it's just a circle that moves with the arrow keys.</p>
  
  <p>My problem is that when it moves it leaves behind an image of itself in every space that it occupies. 
  All I have is <code>$motion_set(0, 5);$</code> as the action.</p>
  
  <p>Any help is much appreciated!</p>