The gameplay involves switching between four camera feeds, which show mundane activity but can alert you to important events. As you switch to a damaged camera feed, you'll see crucial plot clips or engage in single-screen shooting galleries to defend against aliens. However, as cameras take more damage, the picture degrades until they're destroyed.
The objective is to balance monitoring each camera and defending them from attackers while saving citizens from abduction. In a surprising twist, failed rescues may lead to the abducted individuals appearing later as disguised aliens.