This video is one of the full walkthroughs of Left 4 Dead Campaings.
This game is slightly modded, but doesn't affect actual gameplay.

"Curing the Infection... One bullet at a time."
No Mercy is the first campaign in Left 4 Dead and spans five levels.

The first level picks up where the game's introduction cutscene leaves off. The Survivors hear from a passing rescue helicopter they can be evacuated if they make their way to Mercy Hospital. On their trek to safety they encounter Infected-filled apartment buildings, city streets, subway tunnels, and sewers. They discover that Mercy Hospital has been overrun but that there is still a chance of rescue if they can fight their way to the helicopter landing pad on the roof of the hospital.

Full L4D1 Campaigns Playlist: [ Ссылка ]

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