Synergy is a Half-Life 2 co-opertive multiplayer modification.

We have evolved from multiple mods (DC Co-op 2, Dev Co-op and Tim-Coop). This modification strives to give Half-Life players a true Half-Life 2 cooperative experience.

The mod features our own levels and the ability to play the Half-Life 2, Episode One and Episode Two campaigns cooperatively.

In addition, you can add more content by installing third-party mods, such as ROCK 24 and MINERVA: Metastasis, then playing them in Synergy!

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Hello everyone, it's been a while!I have some good news! We have some new development team members to introduce you to. Please officially welcome Travis (Krazy Kasrkin), Edfake and Patrick! They will be working on the various things with Synergy, including the code and maps.
What this means for you is: more updates and more development.We have a changelog ready for you all, which you can see here: Change Log - 44.We do have 2 screenshots to show you as well. We've added another vehicle type, which Fury_161 has created based on the original Buggy. Edfake has updated the scoreboard, with more changes planned. We're looking at figuring out a scoring system as well. Anyway, take a look below:

Also, we've finally returned some of the favourite Synergy content from before the 'OrangeBox' version! Please welcome back kilgore's maps, the Gargantua, the Combine Pulse Rifle and the MP5K weapons!
The following maps have been put back where they belong: syn_Apprehension, syn_DeadSimple, syn_FogIsland and syn_Forgotten_EvilsWe have some interesting things planned for next year, so stay tuned!
Happy Holidays from the entire Synergy Team!

If you do not have Synergy installed on Steam, you can do this by clicking on the following link: Run

Have fun!

Synergy Version 28 Live

Synergy Version 28 Live

4 years ago News 2 comments Report

Another update for Synergy! New characters for Donors and many bug fixes!

The FINALLY!!1 Update

The FINALLY!!1 Update

4 years ago News 16 comments Report

Finally! Actual UPDATE to Synergy, the cooperative mod for Half-Life 2!

Oh, yeah! remember that mod?

Oh, yeah! remember that mod?

4 years ago News 11 comments Report

Yeah, We are back. This time its actually working out between team members and everything is looking up.

"Still Alive..."

"Still Alive..."

5 years ago News 17 comments Report

A small update released that includes an updated map.

Post comment Comments  (50 - 60 of 418)
Zuul_1974 May 11 2012 says:

What's going on with your website?

+3 votes     reply to comment
blu3flamé100 May 11 2012 replied:

Well somethings gone wrong, and the moddb page is very slow so maybe we should start group chat on the official group.

+2 votes     reply to comment
Phenixtri Jan 30 2012 says:

yea I have a question will you guys be adding some custom weapons to the mod? like say some of the cut weapons for example like the smg2 AKA MP5K, XM-29 OICW, AK-47, Alyx gun, Annabelle, exc? Some more variety to the weapons would make the game a bit more dynamic.

+2 votes     reply to comment
VOSK Creator
VOSK May 15 2012 replied:

Yeah some content will be returning.

+2 votes   reply to comment
spik330 Sep 25 2011 says:

i get realy anoying gray boxs when im playing with friends

+1 vote     reply to comment
Gitsdj Aug 20 2011 says:

Is there a custom player model system? and if so were do you get the models? I understand that in this update those awesome looking models are for donors only. But still is there custom models like in the old Synergy.

+2 votes     reply to comment
Clonest Aug 8 2011 says:


+4 votes     reply to comment
Clonest Aug 8 2011 says:

FOR THOSE WHO ARE WONDERING you can DOWNLOAD IT FREE on STEAM if you at lest own Half-Life 2 or any source game I would imagine

+2 votes     reply to comment
Gandbon May 20 2011 says:

i played this alot... it's fun.....with roleplay.....

+3 votes     reply to comment
azultain May 8 2011 says:

Gameplay of synergy

+3 votes     reply to comment
Colek Mar 26 2011 says: 0 votes     reply to comment
JonnyQuattro Aug 10 2011 replied:

Ok fine we'll put it back just because you said so.

+2 votes     reply to comment
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Release Date
Released 2007
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399 votes submitted.

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Ratings closed.

Highest Rated (4 agree) 7/10

Synergy was once the best Coop mod out there. Before it went to steamworks.

Before it went to steamworks it had awesome maps, badass new guns, custom player models, lots of other things, but then they went to steamworks and it unfortunately got bad. They ripped everything off it and left the custom player models just to donators.

The only thing I still like in this game is the "Trials" pack of maps. Only good thing left in it.

Apr 10 2010 by xXMaNiAcXx

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2 years ago
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