The task of this contest was to construct a robot, that could sort all coins of a currency and optionally counts them.
My bot leaves the count a human and dedicates completely the sorting. The coins skid down a ramp, that reduces so far, so that the biggest coin just fits through. Then the floor drops out, only on the sides two small trackages remain, on which the biggest coin skids into the box, but the smaller one falls through.
An overview over the other participants you can find here.