Users Playing this game are also playing:

Portal 2
Portal 2
Half-Life: Opposing Force
Half-Life: Opposing Force
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Portal
Team Fortress 2
Team Fortress 2
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Half-Life 2

Users who own this game also own:

Team Fortress 2
Team Fortress 2
Left 4 Dead
Left 4 Dead
Half-Life 2: Episode One
Half-Life 2: Episode One
Half-Life 2: Episode Two
Half-Life 2: Episode Two
Left 4 Dead 2
Left 4 Dead 2

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Uncharted: Drake's Fortune
Pokemon Platinum Version
Pokemon Platinum Version