Battle viruses to heal the human body at the microscopic level!
Source
http://web.archive.org/web/20121109182034/http://belugerinstudios.com/link.php?url=http%3A%2F%2Fkids.nationalgeographic.com%2Fkids%2Fgames%2Factiongames%2Fnanosurgeon%2F
NanoSurgeon screenshots
