Jim serves in the Marine Corps. Once his unit was given the order to penetrate the military scientific base and destroy all the monsters that are there. Scientists conducted experiments there on animals and humans and now their creation has captured the base. You will need to go through the corridors and rooms of the building in search of monsters. Once you see at least one of them, open fire to defeat. Try to shoot accurately and kill the monsters from the first shot. Some of the monsters will shoot at you in return, so use different items for shelter. Just collect weapons, ammunition and first-aid kits scattered everywhere.