Bacterium is a top-down multiplayer arcade action game. In the future, the quality of the Earth's environment has decreased significantly. Because of this, many unknown diseases have conquered humanity. The likelihood of contracting a serious disease has increased dramatically, while traditional medical methods have become less effective. But people have come up with unique nanorobots that can literally fight any disease inside the patient’s body. You have to try on the role of an operator of one of these nanorobots and take a stand against various diseases.