Game History: Left 4 Dead 2
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The Last Stand Update released
A community-made content update added The Last Stand campaign, new Survival and Scavenge maps, 30 achievements and more than a thousand bug fixes; it was PC only.
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Left 4 Dead 2 released
Valve's co-op zombie shooter launched on Steam, taking four new survivors through the Deep South with new melee weapons and the improved AI Director 2.0.