Listé dans un commentaire de billet sur nofrag et L4DeadMapDatabase, une première map apparemment sympa pour l4dead !
Le lien du fichier :
Most .zip files on this site are meant to be installed to your left4dead folder, which is usually located at C:\Program Files\Steam\steamapps\common\left 4 dead\left4dead. Everything will automatically go where it’s supposed to.
Unfortunately, Valve has not yet enabled custom maps to show up on the campaign selection menu even if they are installed. So you have to start a game on an official map—it doesn’t matter which, then manually change to the custom map by opening your console and typing: changelevel mapname (where mapname is the name of the custom map).
To open your console, make sure it is allowed in your keyboard options, then press ~ while in game.
Note: If you get an error saying the map is unplayable, just press OK and continue playing.[/quote]