I'm having trouble completing an objective in the Tuscan Countryside. The zombie guy needs to go on four special track pieces. No matter what I add, he only seems to recognize three pieces. I've added tunnels, turns, crazy pieces. I can't add loops or inversions because it can't go upside down any more. How can I get the guy to recognize special pieces? I have at least five, and it keeps telling me I have three. Any help would be appreciated! Thanks!