players can repel objects or pull them from a distance. For example, objects can be fired at enemies, held as shields, or placed to reach new areas, and enemy grenades can be caught and thrown back. The player must also use physics to solve puzzles. Half-Life 2 also adds sections in which the player controls an airboat and a dune buggy.

Plot

After the alien invasion at the Black Mesa Research Facility, a multidimensional alien empire known as the Combine

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