While there's no joystick or coin slot, obviously, the three species of microscopic animals are zipping around the maze just fine on their own. And that's just the point -- it was constructed as a way for the researchers to observe the behavioral patterns of the single-cell protozoans and their multi-cellular predators. While the Pac-Man board is obviously far from a natural habitat for these creatures, the walls and channels actually much more similar to real world conditions than an empty and sterile petri dish. With a single cell Pac-Man already happening, what we need next is a controllable nanocar version of Pole Position.