Alien Swarm gameplay
Alien Swarm is a top-down shoot-em-up set at a 60-degree angle.
Four players can join a single co-operative game, the aim of which is to progress through science fiction-themed levels while eliminating waves of aliens.
Players can choose from 40 different pieces of equipment.
Source: http://youtu.be/VmXRGi7T_AA
Alien Swarm gameplay
