Half-Life: Source Substance is a remake of the Half-Life 2 Substance that brings the world from Half-Life 2 to the world from Half-Life: Source. The main idea of this mod is to recreate the Half-Life 2 Substance to the Half-Life: Source. Which means that you will play Half-Life 2 Substance but in Half-Life: Source world. You will use original weapons from Half-Life 2 Substance, but right now in Half-Life: Source world. You will use all features from Half-Life 2 Substance in Half-Life: Source.

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