Users Playing this game are also playing:

Left 4 Dead 2
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Call of Duty 4: Modern Warfare

Users who own this game also own:

Portal
Portal
Half-Life 2
Half-Life 2
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Portal 2
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The Elder Scrolls V: Skyrim
Half-Life 2: Episode Two
Half-Life 2: Episode Two

Users who love this game also love:

Half-Life
Half-Life
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BioShock
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Final Fantasy VII
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Final Fantasy X
Half-Life 2: Episode One
Half-Life 2: Episode One