In this online Flash game, learners investigate the very different behavior of forces at the nanoscale. Learners navigate nanobots of their own design across challenging terrain, and must pay close attention to the positive and negative charges pushing and pulling their nanobots as well as watch out for obstacles and water drops. They can also design (or "mod") courses for other learners to try. The Why? button provides diagrams and explanations about forces at the nanoscale.