Noise

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Noise attracts all zombies in a general proximity towards the player's presence. The level of hearing zombies possesses can be changed in the sandbox settings before starting the game. Some actions generate more noise than others, and therefore are more dangerous to perform. There are many actions that make noise that will attract zombies. These include the following:

Fortifying a door or window with a barricade.
Running.
Walking.
Fire.
Televisions, radios and alarms.
Firing a gun.
Chopping down a tree.
Using the "shout" function.
Smashing windows, doors, and walls.
(De)construction.
Knocking down a door.
Setting off a burglar alarm.
Other zombies knocking at a door or window.
Sneezing and coughing (can be muffled with a tissue).
Having a generator running.
Driving and idling a vehicle.

Noise can be muffled by walls, doors, and distance between the generator of the noise and zombies.

Depending on the game mode selected, or sandbox settings selected, the metagame will have helicopters fly overhead, or random gunshots fired to move hordes of zombies around the map.