Half-Life: Opposing Force is an expansion pack for Valve Software's science fiction first-person shooter video game Half-Life. The game was developed by Gearbox Software and published by Sierra Entertainment on November 1, 1999. Opposing Force is the first expansion for Half-Life and was first announced in April 1999. Randy Pitchford, the lead designer on the game, later noted that he believed Gearbox was selected to develop Opposing Force because Valve wanted to concentrate on their future projects. Over the course of development, Gearbox brought in a variety of outside talent from other areas of the video games industry to help bolster various aspects of design. 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.

RSS Reviews  (0 - 10 of 264)

Good expansion pack

One of the best Expansion Packs out there for any PC Game!

A great expansion to an awesome game.

No Half-Life or FPS player would hate this mod! Awesome gameplay, a satisfying arsenal of weapons, the enemies... AND SO MUCH MORE!!! HL:OF rocks! \m/


Half-Life:Opposing Force comes from an era that expansion packs still mattered. If you loved the original game, this one will make you think that maybe it is even better than Half-Life itself.

One of the best games I've ever played!


The best official expansion pack for Half-Life.


Este es un juegazo,hasta me puedo atraver a decir que es mejor que Half-Life 1!


A Great Expansion Pack for half life it has a great story good weapons and everything a good expansion needs i suggest you play this with half life 1 and blue shift if you are a collection hunter.


One of the best expansions of the original Half-life story.

Community Rating



242 votes submitted.

You Say


Ratings closed.

Highest Rated (3 agree) 10/10

One of the best Expansion Packs out there for any PC Game!

Jan 15 2018 by SweetJuleka