Perimeter is a real-time strategy game built on the concept of territory seizure using detailed terraforming and on the subsequent encircling of these zones with a special protective perimeter. The game combines proven principles of controlling resources and unit groups with titles featuring a clear-cut seizure of living space. The gamer has three powers at his or her disposal: The first is terraforming. The second is being able to surround areas of land with an impenetrable force barrier generated by special perimeter units. The third power is being able to carry out military operations with the help of ground and air forces.