Uses clones, lists and broadcasts to communicate the effect of gravity between sprites. And unlimited number of sprites can be created. They are randomly sized, and large sprites exert more gravity.
This was an overly complex solution to assignment 06 Gravity Simulation. The match used in this example (but not this project itself) can be used to fix "Gravity Challenge" project so that sprite "Gravity NOT DONE" can be pulled towards the mouse as if through gravity, and sprite "Gravity NOT DONE" can then simply be called "Gravity".