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.
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andrewГО
andrewГО - - 785 comments

where xen images from guard duty?

Reply Good karma Bad karma+1 vote
SamuraiMarciano
SamuraiMarciano - - 561 comments

hl2 mod page will be deleted?

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McSug4r Creator
McSug4r - - 1,293 comments

It will very likely stop being updated, we are yet to decide what we do about it. Neither Black Mesa deleted their Moddb profile, although stopped updating it. We will let you guys know when we decide what to do.

Reply Good karma+4 votes
A-Shift
A-Shift - - 308 comments

OBM modpage belongs in a museum! Old media is quite nostalgic

Reply Good karma Bad karma+3 votes
Daburubareru
Daburubareru - - 738 comments

That's fair

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X-Ray.
X-Ray. - - 979 comments

? what

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