Anna and Tommy are explorers of the human body. They travel inside the body in shrinking ship called the Virtual Surgeon. Controlling the Virtual Surgeon, you'll go through the body, one system at a time, learning new things about each one along the way. But you only have a set amount of time to explore, and there are obstacles to hinder your advancement through each system. Take too much damage, or let the time run out, and it's game over.