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Gabe Newell
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LambdaGeneration
Joined 19 Oct 2023
Entropy : Zero
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Source
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GoldSrc
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Sven Co-op
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Black Mesa
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Source Filmmaker
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Garry's Mod
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Team Fortress 2
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Counter-Strike
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Portal
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Left 4 Dead
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Valve
Joined 18 Sep 2022
Half-Life
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