The game is based on the 1966 movie of the same name. The player controls a miniaturized submarine which is injected into the bloodstream of a gravely ill person. Your task is to destroy blood clots which are clogging the arteries in order to keep the patient alive. If you fail to do so or crash your submarine the game is over. While voyaging throughh the body you have to destroy other enemies such as bacteria. However, you should not destroy the blood cells lest the patient dies.
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Forced scrolling vertical shooter with neat touches. This is one of the earliest examples of proximity triggered enemies, where the ship that travel horizontally don't seem to move until you get close enough. It's also refreshing to have an actual health meter represented by the heart rate monitor at the bottom of the screen. One miss here is that you don't really need to shoot the enemies to make your way through the maze. By the time you clear many of them, you'd be flying past them anyway so you can focus on just avoiding them instead.