Vivisector: Beast Within is a first-person shooter which has players exploring some thirty-odd levels ranging from beaches and jungles to the snow covered heights of an inactive volcano. They'll be forced to face a literal army of various engineered animals, from canines with lightning rods on their backs and metal reinforced fangs to the Rhino-truck, to various half-breed like Gepardmen, which utilize Ninja-like mortal combat techniques, or various types of Wolfmen, which field different types of heavy weaponry.