Users Playing this game are also playing:

Halo 3
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Super Smash Bros. Brawl
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Call of Duty: Modern Warfare 2
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Halo: Reach
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Team Fortress 2

Users who own this game also own:

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

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Super Mario World
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Mass Effect