From Black Mesa: Wiki

Black Mesa: Deathmatch

The adrenaline pumping, bullet dodging, rockets-flying, big-red-button riddled deathmatch is back in classic Half-Life style, featuring graphically enhanced multiplayer maps and the full lineup of weapons. You'll find yourself having more fun blowing away your friends than, well, anything.

Overview

Black Mesa Deathmatch is speculated to be similar to HL:Deathmatch. Players will compete with each other online, attempting to do 100 points of damage to their foes with various weapons while remaining above 0 health themselves. However, Deathmatch may not ship with the initial BM release, as development is being focused on completing the Single Player campaign.

Additional Information

It has also been said that for multiplayer game modes, the female assassin model will not be a usable character due to difference in size and animations. ^{[CITATION NEEDED]}