In Opposing Force, critically acclaimed expansion pack for the award winning Half Life, you play as Corporal Adrian Shephard, a United States Marine sent to an underground facility known as the Black Mesa Research Facility on a classified mission. Things go horribly awry, and Corporal Shephard finds himself fighting for his life and the lives of his comrads against hordes of alien creatures and government agents bent on making sure nothing escapes intact.
Operation Black Mesa is a Half Life 2 modfication remaking the second installment of the award winning Half Life series, Opposing Force. Utilizing the immense array of features of the Source engine, the Operation Black Mesa team plans to remake Opposing Force in all it's glory. What we plan to do is remake everything from the 3D models to the maps, so that Opposing Force can once again be praised as one of the best expansion packs for any game to date. We here at the Operation Black Mesa team wish to comprise both single-player and multi-player elements into our modification.
Half-life: Opposing Force is an expansion pack to the award winning Half Life created by Gearbox Software and published in November 1999. You play as U.S. Corporal Adrian Shephard, from the Hazardous Environment Combat Unit (HECU), sent on a mission during the fictional Black Mesa incident.
There are 11 chapters :