Users Playing this game are also playing:

Batman: Arkham Asylum
Batman: Arkham Asylum
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Bully: Scholarship Edition
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Alien Swarm
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Freelancer
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Pokemon Diamond Version

Users who own this game also own:

Portal
Portal
Half-Life 2
Half-Life 2
Half-Life 2: Episode One
Half-Life 2: Episode One
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Portal 2
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Team Fortress 2

Users who love this game also love:

Half-Life
Half-Life
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Geometry Wars: Retro Evolved
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BioShock
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Super Mario Galaxy
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Geometry Wars: Retro Evolved 2