(Note: This game runs excellently on modern systems via Steam or legacy patches, but the raw files are provided here for archival purposes).

When Half-Life launched in 1998, it revolutionized the first-person shooter genre. But while everyone remembers Gordon Freeman’s journey through the Black Mesa Research Facility, there is another story—a darker, grittier, and arguably more brutal perspective. That story belongs to , a U.S. Marine Corporal sent in to "silence" the alien outbreak.

Before downloading Half-Life: Opposing Force, ensure your PC meets the minimum system requirements:

Not officially. However, the fan project "Operation: Black Mesa" is remaking Opposing Force in the Black Mesa engine – it’s free but requires Black Mesa .

: The Barnacle Grapple allows you to scale walls, while the Displacer Cannon can teleport enemies or the player to Xen.