Become a Top Builder! Design an air-powered balloon car that can zip across the floor.

You can use all kinds of materials for your balloon car's body, axles, and wheels. But the jet must include a balloon! Watch the video to see Nate and his friends Desi, AJ, Zara, and Anna design their balloon cars. You can find instructions to get started on your own balloon car in our Build section.

Enter the Top Builder: Balloon Car Challenge by submitting a photo of your design using the form below on or before March 13, 2013. Be sure to tell us how far your balloon car traveled! We'll highlight some of the most creative balloon cars and then you can vote for your fave. The Builder with the most votes earns a special sticker for use on the Design Squad website.