Half-Life: Opposing Force
First Person ShooterHalf-Life: Opposing Force is an expansion pack for Valve Software's science fiction first-person shooter video game Half-Life. The game was developed...
Explore the world, gather resources, merge and upgrade outpost units to build your own outpost.
Unique Weapon
Fully exploit the value of the unique Protoslag Gun with different protoslag attributes, and utilize ammunition with diverse performance.
Exploration and Survival
Enjoy the abundant difficulty levels, diverse gameplay features, and distinctive maps of the exploration mode. Venture deep into the brand new zones full of hazards and opportunities, and harvest powerful outpost units.
Co-op Feature
Fight alongside friends on Harvest Days, or strive together to survive infinite waves of monsters in Endless mode till the last moment.
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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...
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