In Potential, you use force fields to move particles towards goals.
I wrote this a few weeks ago (August 16-18), at the time I couldn't figure out better ways to instruct than big blocks of text.
Now I see a lot of different ways to approach it.
For instance, isometric 3D to show the force fields as slopes.
Or levels with force fields in place already to show how it works.
But here it is, with that Potential unrealized.
Source Code
Made with the same tools as A Change of Plans