Sort through Gary's huge mound of junk, pick out the "thing-a-ma-bobs" and "whatchamacallits" you want, and then figure out which of them fit together. You'll need to put your thinking cap on to build a working vehicle - a roadster, truck, sedan or race car. Along the way, Gary will give minor advice but doesn't give it all away. Using your logic and creativity skills, learn what makes a car tick - and which parts are the best for what your auto should do. (Climbing a steep hill or racing on a race track requires more powerful stuff than Mom's old jalopy!) When you've finished your first vehicle, you can download additional parts from the official website to beef it up and download a bonus game.