Half-Life is a science fiction first-person shooter video game developed by Valve Software. Players assume the role of Dr. Gordon Freeman, a graduated theoretical physicist who must fight his way out of a secret underground research facility, whose research and experiments into teleportation technology have gone wrong. It was released on November 19, 1998.Opposing Force is the first expansion for Half-Life. It portrays the events from the perspective of a US Marine, one of the enemy characters in the original game. The player character, Adrian Shephard, is sent in to neutralize the Black Mesa Research Facility after a scientific mishap causes it to be invaded by aliens, but quickly finds that the Marines are outnumbered and slowly being beaten back by a second alien race and black operations units. It was released on November 1, 1999.

Blue Shift is the second expansion for Half-Life. You play as Barney Calhoun, security guard employed by the Black Mesa Research Facility. After a scientific mishap causes Black Mesa to be invaded by aliens, Calhoun must fight his way to safety. It was released on Jun 12, 2001.Decay is the third expansion for Half-Life. Like first two expansions it returns to the setting and timeline of the original story,
albeit it portrays the story from the viewpoint of a different set of protagonists: two female scientists working in the Black Mesa Research Facility. Decay is a cooperative multiplayer game, designed to be played by two people working together to pass through the game's levels. It was released on November 14, 2001.

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