Half-Life: Opposing Force
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.
- Genres: Shooter, Platform, Puzzle
- Released: 1999-11-10
- Main story: about 6 hours
- Platforms: Linux, PC (Microsoft Windows), Mac
- On: Steam
Track Half-Life: Opposing Force in your Gamepouch