[nebster]

The "Ball on Platform: Edge Balance" one seems super interesting to me.

Is the sample solution just hardcoded or is there some maths behind it to make it work from any location/initial speed?

[hddqsb]

It's robust. I hamstrung the model solution by forcing pistonAcceleration to be 0, and forcing hingeAcceleration to be 0 during the first second, but it still "caught" and balanced the ball.