No Mercy

No Mercy is the first campaign in Left 4 Dead. It spans five chapters. In it the Survivors are told by a passing helicopter to get to Mercy Hospital to be evacuated. On there trek to the hospital they go through an apartment building, city streets, the subway, sewers, and finally through the hospital to the roof to be rescued by helicopter.

Writings on the wall
The Apartments level contains graffiti throughout the map. Much of it is located in the safe room across the street, but some is found on the level start area. "Hope" is spray painted in large letters to the left of the doorway, and "Morbid" can be seen on the right wall, also in graffiti style lettering.

In the safe room, "None of you will survive" and "Entire city is infected, if you can read this, get out", among other things written by other survivors.

Demo
The Left 4 Dead demo consists of The Apartments in its entirety, as well as the first half of The Subway.