These demonstration scripts are for the EDUCATOR robot that can be built using the Education kit (45544). You can also build a close approximation using the Home kit (31313) if you purchase some additional parts such as a gyro sensor and ultrasonic sensor. You can substitute the ball and socket from the Education kit with a single rear wheel.

Building Instructions Using Education Kit (45544): https://education.lego.com/en-au/support/mindstorms-ev3/building-instructions

Building Instructions Using Home Kit (31313): https://sites.google.com/site/gask3t/lego-ev3/building-plans/educator-vehicle-retail-kit-version