I’m guessing it was Frank who taught me this game, but from what I remember the rules are something like
- Your velocity vector updates your position.
- Each turn, you must accelerate your velocity vector by 1 square — up, down, left, or right.
- If you crash into a wall, your velocity drops to zero, and/or maybe there is some penalty.
Teach. Brian. Teach. 
I don’t know who taught you this, but I learned it in ~1980 from Odyssey magazine. I found it challenging to use with kids, though, when I eventually tried using it as a teacher in the 1990s.
Definitely challenging with students. I haven’t tried it too much, but isn’t easy. I think it’d be a good review game for physics majors. 🤔