Plot

A tanker carrying hazardous material was damaged during an accident, allowing the gas inside to escape. Those exposed to the fumes begin to suffer a range of immune disorders, such as rampant bacterial infections, rapidly growing tumors, and widespread tar deposits in the lungs. Patients are being rushed to Xenon Medical Center for emergency microsurgery before their conditions become fatal; the player assumes the role of a member of the surgical staff.

Gameplay

Microsurgeon is one of the first published video games related to health or health education. The player must guide a tiny medical device, the Robot Probe, throughout a patient's body to treat the ailments affecting various organs, such as bacterial infections, brain tumors, cholesterol blockages in arteries, and tapeworms.

At the start of the game, the player is presented with the patient's status chart, which shows information on each individual organ as well as an overall condition, ranging from "Good" to "Terminal." The Robot Probe is equipped with three different treatments: ultrasonic rays, antibiotics, and aspirin. The treatment to be used depends on the ailment; for example, bacteria only respond to antibiotics, while viruses can only be temporarily disabled with aspirin. If the Robot Probe moves outside of the patient's blood vessels or lymphatic system, phagocytes (roaming white blood cells) will attack it and start to drain its power. Moving the Robot Probe and dispensing treatments also use up power.

Any system status will slowly deteriorate toward "Terminal" until and unless it is brought up to "Good" with appropriate treatment. The ultimate goal is to bring the patient's overall status up to "Good" and exit the patient's body through the eye, ear, nose, or mouth before the power runs out. The game ends when the power reaches zero, the player pilots the Robot Probe out of the body, or the overall status reaches "Terminal." The player's score (represented as the total bill for the surgery) is reported only at the end of the game, and is determined by several factors such as the overall difficulty of the surgery and the patient's final status.