Wall Racers was made by 2 cheap (and crap driving) RC cars. I gave them sensors (SRF05), tuned with an extra battery, and gave them own logic / "robot-brains" (Picaxe 28).Primary target is to stay close to the wall, drive fast, and overtake the other :)I would love to make this as a toy, we could add all sorts of cool features, so if anybody out there..? :)You know where to find me; letsmakerobots.com.I will post instructions on how to make your own Wall Racers, also on letsmakerobots.com - it is fairly easy, takes an afternoon or two pr car. You do not need any prior experience, or knowledge about electronics etc. Less