Half-Life: Opposing Force - PC Game

You are looking at computer game Half-Life: Opposing Force.

Half-Life: Opposing Force is the official game expansion for Half-Life, the thrilling PC CD-ROM named game of the year by more than 50 publications, and was developed by Gearbox Software under the supervision of the original creator Valve.

Do you remember those soldiers who made your life miserable in Half-Life? Well, now you’re one of them, and life in Opposing Force isn't easy. As a soldier sent to eliminate Gordon Freeman, you've been separated from your base and discovered the new Alien race. It quickly turns out that it is an advanced life form, known only as Race X, which got to Earth from the Black Mesa lab when Gordon Freeman travelled in the world of Xen.
Initially, you were sent to Black Mesa to silence Freeman and his scientists, but now, first and foremost, you have to fight for your own life against the Race X and many other foes. Luckily, as a military specialist, you’re anything but defenseless – you've got an arsenal of state-of-the-art weapons at your disposal, including prototypes, as well as the Alien weaponry. As you progress into the Black Mesa area, you will meet completely new characters, both friendly and hostile.

The expansion pack consists of 12 new interconnected "levels". There are new weapons and new enemies, plus some new boss creatures. In addition, Opposing Force contains a massive collection of new multiplayer content.

Features:
* Opposing Force takes place concurrently with Half-Life
* Experiment with a host of new military, experimental, and alien weapons.
* Compete in new multiplayer maps designed by industry all-stars.
* New feature to command AI-controlled teammates

Expansion pack: requires full version of Half-Life

Game score: 8.9/10, calculated out of 508 players' votes

For 1 to 32 players

Check out the trailer video:
www.youtube.com/watch?v=ZNZsWm-Ulk4

Developer: Gearbox Software
Genre: Action
Released: 1999

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Game is getting harder to find now, comes in original case.