A standalone expansion of Half-Life
Opposing Force returns to the same setting as Half-Life, but instead portrays the events from the perspective of a U.S. 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.
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Even after replaying and enjoying the first Half-Life more, I still think this is the better game overall. It may not have had the same impact and importance the first game had, but in terms of enjoyment factor and consistency, this easily takes it. Also helps that this game did an amazing job of expanding upon the world of Half-Life and showed it from a different perspective. Bring back Adrian Shephard