While doing research on one of Jupiter's moons, Europa, the people in the station take small mining machines used for research and modify them to play a game called MindRover.
In essence, you take a chassis and build a machine. The machine you need to build will vary on the type of activity you're set out to do (racing, seek & destroy, etc). You place items on your chassis (radars, thrusters, rockets, etc) that you think you might need to help you win.
Next, you wire (or program) your machine with specific instructions on what do. So for example: if you come too close to a wall, you will want to steer away from it. So you will link your sensor to your thruster telling it to turn 45 degrees in the opposite direction if something enters the sensor range.
At the time of December 2000, the game could only be purchased on the Internet for $35 USD (roughly $55 CND). Sometime later the game was purchasable at Electronic Boutique stores.
MindRover is unique in that the game is expandable. If you think the existing way of drag-n-drop is too slow, you can actually write AI code directly in the built-in language called ICE. ICE can also be used to create new components which can then be used as programming blocks.
Originally, the company did not know what to name the game, as they though "Rover" was too "plain". They actually held a contest where they picked the winning name.