Half-Life 2 Substance features an adaptive class system and open-ended gameplay.

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Half-Life 2 Substance v2.0 has been released

Half-Life 2 Substance v2.0 has been released

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Half-Life 2 Substance is back, with all-new version 2.0!

Half-Life 2 Substance Readme

Half-Life 2 Substance Readme

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Half-Life 2 Substance v2.0 Information, Troubleshooting & Credits.