Left 4 Dead is set in contemporary America gone wrong. There are both rural and
urban areas in the four campaigns. Each campaign has around 5 maps. They take place
in the following:
- No Mercy - An urban campaign through city streets and ending on a
hospital roof
- Blood Harvest - A forested campaign ending in a farmhouse in the
middle of a cornfield
- Dead Air - Transpires almost entirely on rooftops and ends at an
airport
- Death Toll - Set in murky woods and underground
