Taking Doom³ PVE (Coop) and PVP (Deathmatch) multiplayer combat to the next level and beyond...
D3 MCS: Mars City Security is a Doom3 Modification that puts heavy emphasis on cooperative and adversarial multiplayer, merging the fast and addictive gameplay of the predecessors (Doom1 & Doom2) with the enhanced Doom3 technology (optimized netcode for Online Internet & LAN networked multiplayer with improved idtech4 unified rendering).
The “Campaign” PVE (Coop) gametype lets players play through default & custom created campaign missions with other players cooperatively. Experience community made custom maps with your friends that tell stories never before experienced in the Doom³ universe.
The “DemonWars” PVE (Coop) gametype throws players right into the epic battle that broke out throughout the entire solar system after hell has been unleashed. Fight as a human with other players cooperatively against the hordes of hell trying to make a last stand for mankind.
The PVP (Deathmatch) gametype lets players fight it out adversarially on a variety of arenas for the ultimate player versus player domination in “team” and “free for all” PVP multiplayer.
IMPORTANT NOTICE !!!
In case the DOOM3 MasterServer happens to go offline you can still browse for online Doom3 and MCS servers at the following link: Gametracker.com
Articles
Mars City Security 2016 Post Release Summary
Fellow MCS fans,
we would like to thank everyone for the amazing online PVE & PVP matches during and after the release of MCS version 1.2.1.8, helping us stress-test this build worldwide in all its glory.
All that positive feedback from community members and new players alike, confirmed our dedication in having spent all the time and resources to bring MCS to its current state.
Special thanks go out to the modDB staff members, who were always very supportive throughout the development and "man!" were we positively surprised to win the editors choice award for the best multiplayer Mod 2015. That truly was the icing on the cake after the public release !
Big thanks also go out to the reviewers here on moddb.com giving MCS such positive review-scores.
We currently are still taking a break from the major effort to get MCS released but we plan to come back with fresh energy to start the work on patches and new features for MCS.
In the meantime here an almost 1 hour long "post-public-release-recap" video, summing up the various MCS trailers and online matches played together online with MCS players worldwide during and after the public release.
See you guys at the online battlefields 
Mars City Security Build 1.2.1.8 Public Release & Download
News 28 commentsTaking Doom³ PVE (Coop) and PVP (Deathmatch) multiplayer combat to the next level and beyond...
MCS PVP Release Candidate Footage & Quality Presets
News 4 commentsTaking Doom³ PVE (Coop) and PVP (Deathmatch) multiplayer combat to the next level and beyond...
"It's done" and MCS finally has a Release Date !
News 9 commentsTaking Doom³ PVE (Coop) and PVP (Deathmatch) multiplayer combat to the next level and beyond...
Mars City Security WIP Update 17
News 8 commentsTaking Doom³ PVE (Coop) and PVP (Deathmatch) multiplayer combat to the next level and beyond...
Files
MCS 1.2.1.8 Windows Installer (793 MB)
Full Version 32 commentsTaking Doom³ PVE (Coop) and PVP (Deathmatch) multiplayer combat to the next level and beyond… D3 MCS: Mars City Security is a Doom3 Modification that...
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Highest Rated (5 agree) 10/10
Fantastic and fun multiplayer mod with coop and all normal multiplayer modes, on a game that add almost no multiplayer at all, and a very basic net code, is to prove that talent is the more important aspect on the quality of a game/mod not the game or engine where you make it.
Dec 24 2015 by Argoon
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Hi again. Same bug at the Monorail level. After the crash with the train just before the door to the automatic railguns (on the bridge). The game slows down to 1-2 FPS and doom guy can jump to ceiling and don´t drop down. Player freezes in the air.
I have tested both spots and no slowdown/freeze issues appeared for me
Computer: I7 6700K 4.5Ghz, 16GB DDR4 2800mhz, Samsung SSD 850 EVO 500GB, Asus Strix GTX 980, Windows 8.1 x64, Nvidia Driver 372.70
Thank you for the information I read your comment and tried it again today. Strange, but it works, no problems as before.
Thx for your bug reports.. we will have a look at those spots and see if we can replicate them.
Hi. I am experiencing a big bug in the single player level communications transfer. Directly before the second service lift station (the one which is farer away after you climb up the ladder) the whole game slows down and framerate drops to zero. At this place if doom guy jumps the player stocks in the air. I can jump to the ceiling and don´t drop down. I restarted the level, same problem. It would be great if you can fix it with your next release. Anyway, amaizibng work and please bring the double barrel shotgun asap :)!(My specs Nvidia GTX 1070, 16GB DDR4, I7 6700-K 4x4GHZ)
Holy **** ! Can this get any more perfect ? I shall download it very soon, awesome to see that the Doom 3Bfg community is not dead and still very active! It is such a marvellous engine...
This isn't a Doom 3 BFG Edition Mod, it's intended for Regular Edition .
Oh... Oooohhhhhh....
M.youtube.com
Is there bots ?
There is friendly and enemy AI synced across the network for various coop gametypes. Additionally a specific player simulating bot for PVP gametypes is planned for future updates of MCS.