Kill 3 aliens at once

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This is best done with the Pipe Bomb (small and silver) or the map's various explosives (barrels, etc). A good early spot for this is the crane ride at the beginning of The Duke Dome. Time the explosion for when the pigs are grouped together. Multiple explosives can also be used to kill the enemies as long as they die at the same time. 3 aliens can also be killed in Mothership Battle while you are on the turret. Dropships will come down and drop off troopers. If you fire into the ship you can kill all 3 at once.