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[[Image:OpposingForce.jpg|thumb|Half-Life: Opposing Force]]

[[Image:OpposingForce.jpg|thumb|Half-Life: Opposing Force]]

'''Half-Life: Opposing Force''' is a First Person Shooter released in October of 1999 by Gearbox Software for the [[:Category:PC games|PC]].  OP follows the [[Half-Life]] storyline except that you play as a Marine instead of Gordon. The series continued with [[Half-Life 2]].

'''Half-Life: Opposing Force''' is a First Person Shooter released on [[October 31]], [[1999]] by [[Gearbox Software]] for the [[:Category:PC games|PC]].  Opposing Force takes place at the same time as [[Half-Life]], and at various points in the game there are visual and verbal references to [[Gordon Freeman]] (e.g. You can once hear the exact same saying over the radio as you hear in the original Half-Life.) As a twist in the gameplay, in Opposing Force you play as Adrian Shepard as opposed to Gordon Freeman in the first game. The series continued with [[Blue Shift]].

 

Along with some minor AI updates, a new "series" of monsters, [[Race-X]], was added. It is unknown where they came from or how they got into [[Black Mesa]] as they don't show any resemblance to the aliens from [[Xen]]. Opposing Force is the first Half-Life game to feature "classes", various people you can run into that will help/follow you. The game also had a few weapons replaced, but added some too, the most notable being a [[Barnacle]] that you can use like a grappling hook, although it will only attach to living things. It is unknown how Barnacles are able to tell the difference, and there is a difference in this between the games: in Opposing Force the Barnacle can immediately tell if what you "shoot it at" is alive, and if it isn't, it will come back. However, in [[Half-Life 2]] you can throw a barrel at ones tongue, and it will take it all the way up to its mouth before dropping it.

== Speed Runs ==

== Speed Runs ==