You can defeat the beasts by fumigating them with the help of a special team. You may act as a fumigation officer giving battle to the cockroaches. To fight the cockroaches you can use the following weapons: anti-cockroach spray, scattergun, mini gun and machine gun. All weapons except for the first one are destructive for the items located in the room. You will be losing points for any damage made. Good luck defending your rights of ownership!