The Hot Wheels Track Builder System offers the ultimate track experience for boys by allowing them to design, create and customize their very own track challenges. Using a variety of stunts, layouts and essential pieces that work together or connect to existing sets, boys can be the master of their own track. With the Expert Stunt System, boys choose from a variety of complex and challenging, car activated stunts for maximum adventure. Plus new connectors make it easy to connect with other sets! If kids can dream it, they can build it with Track Builder! Ages 3 and older.