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Half-Life: Opposing Force

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Steam portrait hl1opfor.jpg
Half-Life: Opposing Force

Gearbox Software

Release date(s)

November 19, 1999[1]


First-person shooter




Windows, macOS, Linux


ESRB: M (Mature)


Sierra Entertainment(previously)

System req

500 MHz processor, 96 MB RAM, and 16 MB video card


Keyboard and Mouse






Randy Pitchford


Stephen Bahl
Rob Heironimus
Kristy Pitchford
Randy Pitchford


Chris Jensen

Previous game

Half-Life: Uplink

Next game

Half-Life: Blue Shift

Half-Life: Opposing Force, commonly abbreviated as OpFor or Op4, is a critically acclaimed expansion pack for Half-Life, developed by Gearbox Software and released by Sierra Entertainment on November 19, 1999.


In Opposing Force, the player returns to Black Mesa as Corporal Adrian Shephard, one of the soldiers sent in to eliminate the civilians from the original game. On an undisclosed mission to Black Mesa, things don't quite go as planned, and Shephard gets separated from his unit at the beginning of the game.

Now alone and without any orders, Shephard must face not only a new alien threat alongside the Xenian invaders, but also the government agents sent in after the soldiers pull out - their mission being to cover up the incident by destroying the facility and eliminate everything and everyone in their way, including the soldiers who were left behind.




In the single-player campaign, some of the new weapons replace their Half-Life counterparts (Desert Eagle – .357 Magnum, M40A1 – Crossbow, Pipe wrench/Combat knife – Crowbar, Shock Roach – Hivehand). However, in the multiplayer game the player can carry both the new Opposing Force weapons and their Half-Life variants at the same time.


Half-Life: Opposing Force was announced on April 15, 1999 to be developed by Gearbox Software.[2] At the time, Gearbox was a new company formed by the core members of the defunct Rebel Boat Rocker which had been shut down after a struggle with their publisher on their first video game project. The team wanted to work on small scale titles based on an existing technology rather than creating a completely new game.[3]

Meanwhile, Valve was busy with developing Half-Life 2 and its supporting engine technology.[4] They were looking for someone to take over their role and expand the Half-Life universe so they could focus on their future titles. Gearbox had connections at Valve and were interested in meeting them to see what they could put together. However, Gabe Newell ended up calling them first as he had a similar idea for a project. Through their connections, Gabe was told what Gearbox was doing, and he believed they'd be a good fit. Both companies got together to discuss and explore the possibilities.[5]

Randy Pitchford pitched the idea of player returning to Black Mesa as one of the soldiers invading the facility occurring during the same time as the events of Half-Life, retelling the story from another character's perspective. He likened the concept to the play Rosencrantz and Guildenstern Are Dead.[4] Newell, inspired by The Alexandria Quartet series of novels, also wanted to have a Rashomon-esque structure and allow the players to experience the same events from a different point of view.[6] The deal was signed, and the production of the Opposing Force expansion pack went forward.


Opposing Force received a very favorable reception from critics, holding a score of 85.45% on the review aggregator site GameRankings.[7] Although figures for the game's sales on Steam have not been released, Opposing Force has sold over 1.1 million copies at retail.[8]

Computer and Video Games reviewer Kim Randell noted that "Gearbox has obviously gone to great pains to provide a similar experience to the original". Praise was also given to the game's multiplayer; Randell stated that the new additions for multiplayer made it the area of Opposing Force that "really shines". Randall closed the review by concluding that Opposing Force is "an awesome achievement".[9] Erik Wolpaw, writing for GameSpot, noted that as most expansion packs were mediocre, "it's appropriate that Gearbox Software's Opposing Force, the official expansion for the genre-redefining Half-Life, in turn sets a new standard of quality for future action-game mission packs". Wolpaw praised the design of the single-player campaign, commenting that "you can sense the designers' enthusiasm as one memorable scene unfolds after another, and it compels you to keep playing". Although criticizing some elements of the game's artificial intelligence and describing some of the new models as "merely window dressing", the review concluded that Opposing Force was an "impassioned application of creative design".[10]

Other reviews echoed many of the positive aspects of the game. GamePro stated that "Gearbox has done one hell of a job in creating not just an add-on for Half-Life, but a continuation of a masterpiece", praising both level design and story elements, but noted that it was a little too short.[11] However, some critics dissented on the idea that Opposing Force was as influential as other reviewers made out.

PC Zone stated that "the taste left in the mouth is a bitter one", noting that "Opposing Force is a few excellent ideas strung together by pedestrian Half-Life padding", but concluded that "it was still a good weekend's worth of entertainment".[12] Eurogamer stated that Opposing Force still had similar problems to other expansion packs, commenting that "χ amount of new content has been created and it is going to be cut into the old content in a linear way to make it look like an all new game", but noted that "fortunately though the new stuff in Opposing Force... is pretty damn good". Although praising the level design as the game's strongest point, the reviewer felt that "towards the end of the game... they were running out of development time".[13] Reviewing for IGN, Vincent Lopez stated that the game "does a fantastic job of making you remember exactly why you enjoyed the original so much", but criticized this as the biggest drawback, commenting that "you may find yourself wishing for a more original experience", but concluded that "for good, and bad: it's good to be back".[14] The game won several publication awards,[11] as well as the Computer Action Game of the Year Interactive Achievement Award of 2000 from the Academy of Interactive Arts & Sciences.[15]



  • The demo version was released after the game's release on March 4, 2000. It features portions of Welcome to Black Mesa, Friendly Fire and Foxtrot Uniform with minor changes.
  • If the player follows Gordon Freeman through the portal to Xen in We Are Not Alone, the game will end, accusing the player of trying to rewrite history with a game over message that says: "Evaluation terminated, Subject attempted to create a temporal paradox". Additionally, it is possible to kill Gordon immediately after following him through the portal to Xen. Shephard can fire an assault rifle grenade or an RPG rocket onto Gordon's platform before falling to his death, gibbing Gordon with the resulting explosion. However, nothing changes; the same paradox end message still shows before loading the last save point.
  • This is the only game in the Half-Life series to feature night vision instead of the flashlight and the only one to have the rope-climbing mechanic.






Half-Life: Opposing Force
Combine OverWiki has more images related to Half-Life: Opposing Force.
  1. Opposing Force Arrives This Week! on (November 17, 1999) (archived)
  2. Half-Life Expansion Announcement on Blue's News (April 15, 1999)
  3. Gearbox interview on Belgian Webgaming Forever (September 5, 2003) (archived)
  4. 4.0 4.1 From Half-Life to Borderlands: Gearbox rides the rocket on The Verge (March 28, 2012) (archived)
  5. Shifting up a gear: Randy Pitchford Interview on Computer and Video Games (February 26, 2002) (archived)
  6. Half-Life 10th Anniversary Interview on GameSpy (November 19, 2008) (archived)
  7. Half-Life: Opposing Force Reviews on GameRankings (archived)
  8. Analysis: Valve's Lifetime Retail Sales For Half-Life, Counter-Strike Franchises on Gamasutra (December 3, 2008)
  9. PC Review: Half-Life: Opposing Force on Computer and Video Games (March 26, 2007) (archived)
  10. Half-Life: Opposing Force Review on GameSpot (November 24, 1999) (archived)
  11. 11.0 11.1 Review: Half-Life: Opposing Force on GamePro (December 29, 2008) (archived)
  12. PC Review: Half-Life: Opposing Force on Computer and Video Games (June 24, 2007) (archived)
  13. Half-Life: Opposing Force Review on Eurogamer
  14. Half-Life: Opposing Force Review on IGN (November 25, 1999)
  15. AIAS Annual Awards: 3rd Annual Awards on Academy of Interactive Arts & Sciences (March 16, 2000) (archived)

External links[edit]