Doodle-Cars are like slot cars without the slot. They have "patented optical sensors "underneath, letting them follow any dark line. You can draw that track yourself, or you can create tracks on the company's website and then print them.
One thing that worries us about this $14.99 toy: It's the "NEW IMPROVED" model, giving us a hint that its maker has no qualms about releasing a product that doesn't work very well the first time. Uh-oh.
One improvement we might suggest would be to make it so you can control the speed of these cars as they find their way along the black line.