And to prevent this, you will need to use the only effective medicine - sex. And also, the longer you survive, the more enemies you will encounter at leve. You will be opposed by different monsters that will gradually infect you with a virus. Act as a surviving soldier of a special squad. Levels and their sequence are always different. Therefore, starting a new game every time different locations will be waiting for you. Your main goal is not to die and have sex with as many girls as possible.
more information...