The enemy in this game are robots of varying sizes and abilities. Depending on their size, they are vulnerable to small arms fire, large calibre weapons and rockets. The smaller robots will explode relatively quickly, whereas the larger varieties will withstand more punishment, but will in the end explode. When played in multiplayer mode, it is possible to observe team characters being shot by the robots. When shot, they can either respawn nearby or elect to wait for another team member to revive them. None of the human characters display any injuries.