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 (62 reviews) - 85% of the 62 user reviews in the last 30 days are positive.
Overall:
Very Positive (3,158 reviews) - 93% of the 3,158 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 (62 reviews)
Overall:
Very Positive (3,158 reviews)
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1,923 reviews match the filters above ( Very Positive)
Most Helpful Reviews  In the past 30 days
25 of 26 people (96%) found this review helpful
17 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
6 of 7 people (86%) found this review helpful
9 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

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3 of 3 people (100%) found this review helpful
Recommended
0.1 hrs on record
Posted: September 26
tried it and its hella fun, just make sure that you play with your friends not alone, you'll have a lot more fun!
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2 of 2 people (100%) found this review helpful
Recommended
2.3 hrs on record
Posted: September 17
O____ pretty decent source mod
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3 of 4 people (75%) 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 ^^
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1 of 1 people (100%) found this review helpful
Not Recommended
2,030.5 hrs on record
Posted: September 26
Being bantered as a "Co-op" mod for a mother-♥♥♥♥ing awesome game like Half-Life 2, I really had high hopes for Synergy but you have no idea how disappointed I ended up being after just a few weeks of playing this so-called "Co-Op" game. I was so ♥♥♥♥ing gutted I felt suicidal and ♥♥♥♥♥♥ off with the World in general. I still have nightmares now.

Reasons this game sucks in no particular order:-
1) The very rare but no less unnerving hostile banhammer admin (though thankfully his server is now 2 years dead!)
2) A ♥♥♥♥-load of glitches
3) A ♥♥♥♥-load of bullying trolls
4) A ♥♥♥♥-load of rushers
5) No teamwork
6) A ♥♥♥♥-load of banhammer wannabes aka trolls that are not admins but act like they own the place by trying to act badass by kicking or banning decent or even great players from a server or scaring them into leaving or otherwise just being hostile

If you value your sanity, do NOT play this!

Forgive me if I come across as a sensitive prick or insane but it is a sad irony that so-called players act this way in Synergy. Half-Life 2s back story is becoming reality in my opinion. The World is becoming crapsack. Resources are dwindling slowly but surely. The World looks set to experience a never ending heatwave not seen for 55 million years in just a matter of decades. Fauna and Flora are becoming extinct. People are fighting and suffering Combine-esque punishment. The only thing is, the enemies are not the Combine or Xenian, it's ourselves.

My point is; If we can't play together as a team in a so-called "Co-op" game, by helping and healing and arming and transporting each other and by being friends instead of being banhammer wannabes or just rushing or being plain hostile or indifferent, then what chance has the World got of surviving it's worst era thus far? Instead of being part of a messianic Resistance, we are acting like the Combine. :(
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1 of 1 people (100%) found this review helpful
Recommended
38.8 hrs on record
Posted: September 11
Free desert eagle with every impulse 101
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1 of 1 people (100%) found this review helpful
4 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
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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!!
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1 of 2 people (50%) found this review helpful
Recently Posted
The Gaming Kirby
9.7 hrs
Posted: September 28
It's Half life 2, but with friends......







































































That's it, I hope you know :l
Helpful? Yes No Funny
SAM I AM
7.3 hrs
Posted: September 26
Awesome mod!!! Needs support for the new Black Mesa stand alone!!!!
Helpful? Yes No Funny
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
13.5 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
22.1 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