Updates to Left 4 Dead 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include: Death Toll campaign released. We are releasing the beta version of Death Toll today. We have made a few changes based on issues we saw during internal testing. It will be interesting to see what people think of those changes. No hints on what the changes are, we want you to play with fresh eyes. Please post all feedback and bugs to the L4D2 Steam Forums.
Source: Left 4 Dead blog.
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