Left 4 Dead 2 Authoring Tools and Left 4 Dead 2 Add-on Support released Valve has released the Left 4 Dead 2 Authoring Tools and Left 4 Dead 2 Add-on support as a Christmas present to the L4D 2 ...
On top of knocking 33% off Left 4 Dead 2 PC today, developer Valve has released the tools that allow owners of the zombie shooter to create and play their own content. The optional "Add-on Support" ...
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