You’re driving a cart or something with lots of cargo.
You need to make sure whatever physics objects are on top of you stay balanced (and don’t fall over).
This is, again, based on the PoleBalancing demo projects they often use to test AI algorithms. But we can extend it to use different shapes, or a stack of boxes that grows larger over time (as you must catch boxes coming from above), etcetera.
In other words, the driving/moving should be very simple, with an extremely simple road or randomly generated level. The hard part is keeping the cargo on top of you balanced and not-falling-off.