The idea is genius, but here are my problems with the effect.
#1. The instructions state the car
can be wound up. It cannot.
#2. The device that attaches to the car falls off a lot.
#3. My
biggest concern is when the car rolls across the cards there are many times it will not stop on the
card.
I don't want to reveal to much about this effect but the car wont stop on any card until
it rolls over the right spot.
For the price of this, I expected a little better.