This system allows custom campaigns and other add-ons to be browsed, interacted with and downloaded directly through the Steam client, even while in-game. With the exception of these featured campaigns, most custom campaigns can only be played on Third-Party Servers or Local Servers (including Single Player mode).Īfter the Februupdate, Steam introduced the Steam Workshop where users can upload their custom created maps or content. They have also released audio recordings by the voice actors of the Survivors for use in specific custom campaigns and feature some custom campaigns on their online blog, as well as uploading specific custom campaigns onto the official servers for more accessibility.

They have a SDK for each of their games including Left 4 Dead and Left 4 Dead 2, which allows for easy creating and installing of custom campaigns. Xbox 360 players are unable to use custom content due to technical and financial difficulties regarding porting community-based content over. Custom content can only be created and used by PC users. Some custom maps are specifically designed for game modes like Scavenge and Survival.

Custom Campaigns, also known as Community Campaigns, are community-created campaigns that can range in size from a full campaign, to a single chapter.