Operation: Black Mesa

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About

Experience the Half-Life™ expansion packs like never before. Operation: Black Mesa features reimaginings of both Half-Life™ Opposing Force and Half-Life™ Blue Shift through two unique campaigns. How will you survive the Black Mesa Incident? It's time to choose.

Operation: Black Mesa is a fan-made reimagining of Gearbox's Half-Life™ Opposing Force and Half-Life™ Blue Shift.

Two Campaigns in One

Experience two unique single-player campaigns taking place during the Black Mesa Incident that started off the events of the Half-Life™ universe. Survive a day job gone wrong as security guard Barney Calhoun. Escape the doomed facility after a FUBAR'd mission as Corporal Adrian Shephard of the Hazardous Environment Combat Unit.

Features

Two single-player campaigns featuring expanded gameplay and new content.
A plethora of engine enhancements and new graphical effects. The Source engine looks better than ever.
Fast-paced combat with over 30 unique enemy types - Run. Think. Shoot. Live.
Over eighteen weapons suited for all play styles. How will you survive Black Mesa?
Original music. Two games - two soundtracks.
Expanded narrative elements to connect with established Half-Life™ lore.
Customize the game to your liking with a mod-friendly set of tools.