An alien spacecraft hovered over the territory of one of the military bases located in America. Aliens began to land from it, and they attacked the soldiers. You in the game Green Slaugther in the squad will have to fight back. Before you on the screen you will see your character with a weapon in his hands. Monsters will attack him from all sides. You will have to maintain a distance to aim at them the sight of your weapon and open fire to kill. Shooting accurately at the enemy, you will destroy them. For each enemy you kill, you will receive points. After the death of aliens, trophies can fall out of them. You will need to collect them all.