Users Playing this game are also playing:

Left 4 Dead
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Company of Heroes
Company of Heroes
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Sins of a Solar Empire
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Command & Conquer 3: Kane's Wrath

Users who own this game also own:

Portal
Portal
Half-Life 2
Half-Life 2
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Sid Meier's Civilization V
Half-Life
Half-Life
Portal 2
Portal 2

Users who love this game also love:

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Mass Effect 2