Synergy is a simple Half-Life 2 Modification (Mod) that enables you to play through the Half-Life 2 series and many other 3rd-party campaigns cooperatively with friends.
User reviews:
Recent:
Very Positive (64 reviews) - 87% of the 64 user reviews in the last 30 days are positive.
Overall:
Very Positive (3,153 reviews) - 94% of the 3,153 user reviews for this game are positive.
Release Date: Sep 1, 2005

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Community-Made Mod

This game requires that you own Half-Life 2.

Click here to learn more about mods on Steam.

Install Synergy

Half-Life 2 Mod

 

About This Game

Synergy is a simple Half-Life 2 Modification (Mod) that enables you to play through the Half-Life 2 series and many other 3rd-party campaigns cooperatively with friends.

Supported Games:

System Requirements

Windows
Mac OS X
SteamOS + Linux
    Minimum
    OS: Windows® 7 (32/64-bit)/Vista/XP
    Processor: 1.7 GHz Processor (Requires support for SSE2)
    Memory: 512MB RAM
    DirectX: DirectX® 8.1
    Hard Drive: 1 GB available space
    Sound Card: DirectX Compatible
    Network: Broadband Internet connection
    Recommended
    OS: Windows® 7 (32/64-bit)/Vista/XP
    Processor:Pentium 4 processor (3.0GHz, or better) (Requires support for SSE2)
    Memory: 1GB RAM
    DirectX: DirectX® 9
    Minimum
    OS: OS X Mountain Lion 10.8
    Processor: 1.7 GHz Processor
    Memory: 1GB RAM
    Graphics: NVIDIA GeForce 8 or higher, ATI X1600 or higher, or Intel HD 3000 or higher
    Hard Drive: 1 GB available space
    Network: Broadband Internet connection
    Minimum
    OS: Ubuntu 12.04, SteamOS
    Processor: 1.7 GHz Processor
    Memory: 1GB RAM
    Graphic Card: NVIDIA GeForce 8 or higher, ATI X1600 or higher, or Intel HD 3000 or higher
    Hard Drive: 1 GB available space
    Sound Card: OpenAL Compatible Sound Card
    Network: Broadband Internet connection
Customer reviews
Customer Review system updated Sept. 2016! Learn more
Recent:
Very Positive (64 reviews)
Overall:
Very Positive (3,153 reviews)
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Display As:
1,919 reviews match the filters above ( Very Positive)
Recently Posted
Fish 112X
4.6 hrs
Posted: September 25
this game is worth it
Helpful? Yes No Funny
Numb Digger
31.8 hrs
Posted: September 24
A mod left to rot.

I'll be straight forward with this.

PROS
-You can spawn your own vehicle...! The bad thing about that is that you won't be using it much.
-More weapons! That includes the Desert Eagle, MP5k and one more I think
-Fun with friends, if you have any

CONS
-Every server has a ping of 400 to 3000
-Barely anyone plays it. If you are lucky enough, you will find a server with 5 Russians on it
-The difficulty is obsurd. It will take you about 3 magnum shots to the head of a metrocop to kill him at the easiest difficulty.
-(Hey what's up guys) Scarce ammo supply, even if you have a few players
-Buggy as hell
-Very, very long level transitions
-Never updated


I had high hopes for this. Half Life 2 is one of my favorite games of all time, and I thought it would be even better to play it with other people.
Mods, fix this ♥♥♥♥♥♥♥t.
Helpful? Yes No Funny
Malvhis
6.8 hrs
Posted: September 23
The review below this review is more factual and therefore more helpful.

Glad to be of help.
Helpful? Yes No Funny
Dr. Lanky
8.9 hrs
Posted: September 21
A very well made co-op mod. I recommend this game to anyone who has Half-Life 2, friends, and patience
Helpful? Yes No Funny
Jobel's Desktop Stripper
21.2 hrs
Posted: September 18
Theres nothing much to say other than, it's HL2 Co-op.
With some BS features like not being able to reload while sprinting.
p i c k u p t h a t c a n
Helpful? Yes No Funny
<Kl0n[d1k]E>
16.0 hrs
Posted: September 16
The game itself is a great mod, works well.

It's just limiting that it comes with no special maps of its own, since you seem to need HL2:Ep1-2 for the ones that allegedly do come with the game (ultimately meaning that all I have at the moment are HL2:Ep0 maps), and there aren't many good maps online made for this game. I guess I'll just have to wait for Sven Co-Op to revert to what it was and just play that for now.
Helpful? Yes No Funny
Martin Shkreli
1.6 hrs
Posted: September 15
Half-Life with multiplayer but nobody plays it. 8.5/10
Helpful? Yes No Funny
Most Helpful Reviews  In the past 30 days
20 of 21 people (95%) found this review helpful
11 people found this review funny
Recommended
14.9 hrs on record
Posted: September 3
i dont have friends.
Was this review helpful? Yes No Funny
7 of 7 people (100%) found this review helpful
Recommended
36.7 hrs on record
Posted: August 26
Needs black mesa support
Was this review helpful? Yes No Funny
4 of 4 people (100%) found this review helpful
6 people found this review funny
Recommended
12.8 hrs on record
Posted: August 30
play as 4 random rebels pretending to be gordon freeman while trying to save the world by screaming "HELP!" and dreaming about cheese

10/hellodoctorfreeman

Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
Recommended
5.6 hrs on record
Posted: September 3
You already know that half life 2 is ****ing great, now with this mod you will feel its greatness again but with your friends ^^
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
2.3 hrs on record
Posted: September 17
O____ pretty decent source mod
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
1 person found this review funny
Recommended
36.4 hrs on record
Posted: August 28
half life 2 mods game. this game takes all the half life 2 mods and puts it in one place thats easy and simple, plus theres no achievements, so u can fool around in hl2 with cheats and commands without the pressure of not cheating. play the real hl2 1st then play this as a bounus feature. oh this is ment for playing with friends in servers? yeah that part is awful, so dont bother. it runs like turtle ♥♥♥
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
8.9 hrs on record
Posted: September 18
I love this game so much! Half-Life 2 is one of my favorite games
I used to constantly play it on the Xbox and when I got PC I got it for PC and constantly played it until I got all the achievements.
Now I find this game that I can play with my friends???? YES!!!
And it's like hard mode for Half-Life 2. I love everything that was done to the game.
Only problem I have is that it says I don't have HL2:E1&2 when I do.

But other than that 10/10 I love this game!!
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
2 people found this review funny
Recommended
13.5 hrs on record
Posted: September 17
Finds a car. Drives with it. Stops to get supplies. Another Player takes the car and drives in the ocean with it. 10/10
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
36.8 hrs on record
Posted: September 11
Free desert eagle with every impulse 101
Was this review helpful? Yes No Funny
1 of 2 people (50%) found this review helpful