Back in the days of the old official LEGO MINDSTORMS site, there was challenges with various degrees of difficulty. Prices were emblems that would be seen on your profile or invention.
One such challenge was the Geosa Rescue Rover Mission in which you´ld have to make an obstacle course, simulating a mars base. The mission, as far as I recall, was to get the robot to a fuel-cell area, grab the empty fuel-cell, drive up a "cliff" path, dump the empty fuel-sell in a designated area, grab a full one and find the way back to the start area. Or something like that.
I had great fun playing around with that challenge, but unfortunately no pictures of the "terrain" have survived, only this mugshot:
FEATURED:
Motorized Grabberarm, heavily inspired by the one from the Droid Developer Kit. It can grab and lift with a single motor. In the lifted position there was plenty of clearance to enter the ramp that worked as the cliff path.
Light sensor that determined which fuel-cell was empty; one was white/clear, 2 others were black.
Rotation sensor that made the rover stay on course. Sort of...
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