Under the Black Moon

Under the Black Moon

Author B-dama
Original mod release June 30, 2002
Date of release April 12, 2019
Last update v1.5.1 - September 28, 2019
.bsp filename of_utbm (9 maps)


A conversion of the original Half Life: Opposing Force mod created by B-dama, ported to Sven Co-op.
We hope you enjoy!

You are Private Daniel Shephard, a new recruit of the Hazardous Environment Combat Unit. Your brother Adrian became a Corporal in less than 3 years- very few people have ever become an officer that quickly.

After crash landing on your way to Black Mesa, you find yourself stranded and your comrades never made it.
As a lowly grunt you have been given the perfect opportunity to prove yourself and show that Adrian isn't the only successful one in the family. Escape an infested research facility with aliens and a whole battalion of Black Ops… its going to be hell.

Additional info

This campaign has been ported and optimized for Sven Co-op: enemies are more challenging and varied, more items can be found and uses the much higher quality default Sven Co-op models.

  • Sven Co-op Assault rifle has been added to the game
  • Working nightvision flashlight
  • Many secret items have been added
  • New final boss

Additional credits

Sven Co-op Conversion

Special thanks to H2 for the crouch spawn script

And our humble thanks to all who supported us make this conversion a reality.



2002 black-mesa conversion featured secrets size:large survival walkthrough

edit tags


Rate this map

4.8 / 5 (4 votes)


write a full review »

Comments & discussion

Add a New Comment

There are over 1296 maps for Sven Co-op! Here are a few:


3.3 / 5

2002 2003 black-mesa creepsworld-top50 official official-screlease rcbot size:large walkthrough


3.3 / 5

2018 boss defense difficulty:easy difficulty:hard fun horde music size:small


1.5 / 5

2001 defense horde needs-dl size:small


1 / 5

2003 fun size:medium traps walkthrough


2.3 / 5

2016 abandoned experimental fun open-world rmf size:medium

Unless otherwise stated, the content of this page is licensed under Creative Commons Attribution-ShareAlike 3.0 License