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Half-Life: Opposing Force

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Half-Life: Opposing Force

Half-Life: Opposing Force is a First Person Shooter released on October 31, 1999 by Gearbox Software for the 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.


The Speed Demos Archive hosts Opposing Force competition. The current proven World Record for a complete-game OF speedrun on Hard mode is 23 minutes and 9 seconds, achieved by Blake "Spider-Waffle" Piepho on February 12th, 2005.

Speedrun Strategies

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External Links

Half-Life Series

Half-Life (Opposing Force, Blue Shift, Decay)
Half-Life 2 Old Engine (OE)/New Engine (NE) (Half-Life 2: Episode One, Half-Life 2: Episode Two, Half-Life 2: Episode Three, Half-Life 2: Episode Four)