This is a prototype model made out of household stuff.
The tracks are made out of a kitchen mat and the wheels with bottle caps.
In the next video the robot that detects slopes (with an accelerometer) and runs uphill until it reaches an horizontal zone or finds a cliff (with IR proximity sensors).
The next goal is that it moves forward on medium gray horizontal surfaces (floor) and climbs up over white (other robots) surfaces until it gest to the top of the heap (an horizontal white place).
The thing is part of the babelbots project.