This is a prototype I worked on for a larger adventure map that some friends and I were working on for fun.

The idea was that the player could jump on these "swings", causing them to lower 1 block from the weight of the player
In turn, a weight somewhere else in the room would get lifted.



The player would be challenged to jump on the different swings in the right order while another player "locks" the weights in place to eventually open a large mechanical door, once all the weights are locked in at the correct height.

This never got further than just some prototypes, but it was cool to experiment with the possibilities that command blocks have to offer in creating unique adventure map mechanics. :)