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Half-Life
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Share Half-Life news and community content, including mod updates, fan art, fan films and more.

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Portal
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Portal and Portal 2 news and fan content. Now you’re thinking with portals.

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Team Fortress 2
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The most fun you can have online. Now as a subcommunity.

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Source Filmmaker
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The official unofficial SFM subcommunity. Share SFM and S2FM posters, animations, guides, tutorials, and more.

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Valve
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The unofficial Valve community. For all things Steam, Source and more. Just don’t mention what comes after 2.

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Black Mesa
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The official subcommunity for Black Mesa. Revisit the world that started the Half-Life continuum.

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LambdaGeneration
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The official LambdaGeneration Community community. News, feedback and support related to our platform and LambdaBuilds.

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Sven Co-op
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The official Sven Co-op subcommunity. Pleasing Taste, Some Monsterism.

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Garry's Mod
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Left 4 Dead
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