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. Here, zap filled, high-voltage excitement is waiting in the Flip Tower™. Connect it to other Hot Wheels® tracks and get ready to take on and take down the tower. Make one wrong move and you'll be flipped right off track! If you can dream it, you can build it with Track Builder! Not for use with some Hot Wheels® vehicles.