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The Source Engine is the name of the game engine that runs Half-Life 2, Counter-Strike: Source, Portal and Day of Defeat: Source, among others. The engine boasts a modular design that allows for easy plug-in of third-party resources such as the Havok Physics Engine, high-dynamic-range lighting (demonstrated in Half-Life 2: Lost Coast), and multiple other features.
Games using the Source Engine[edit | edit source]