What is Add-Ons Campaign ?
Add-On campaigns are extra campaigns made by the community, that you can download and play.
You can find some at l4dmaps.com.
Oh, but to play them, you'll have to go to your Steam Tools tab, and download "Left 4 Dead 2 Add-On Support". If you don't, they won't play or work correctly.
cjnoone - 6 years ago
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