You've probably met Yellow Circle Guy and his Ghost Friends before or at least know of them. They are great at a lot of things, especially at chasing each other around hallways and sharp corners. But a lot of people don't know that they are really good at helping Ninjas Train. 
 
These obstacles were originally made for an awesome comp but since Yellow Circle Guy and his Ghost Friends love Halloween - we thought it was a good time for them to come out and say "Trick or Treat"!