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: Very Positive (2,784 reviews) - 94% of the 2,784 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
Helpful customer reviews
75 of 78 people (96%) found this review helpful
58 people found this review funny
65.3 hrs on record
Posted: August 22, 2015
Want to play Half-Life?
Don't want to be lonely?
Want to shout help constantly?

Then this game is for you!

Featuring state of the art steam matchmaking, you can easily connect to strangers around the world, such as russians who you can't understand, and proceed to shout voice commands at them.

You can even drive a mini-van.
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59 of 62 people (95%) found this review helpful
63 people found this review funny
31.0 hrs on record
Posted: November 28, 2015
Would be good if you had friends
Was this review helpful? Yes No Funny
24 of 29 people (83%) found this review helpful
12 people found this review funny
28.4 hrs on record
Posted: August 17, 2015
Half life 2 and all it's episodes except you can do it with multiple people and you can't save progress.
10/10 would lose progress in nova prospekt again
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17 of 18 people (94%) found this review helpful
6 people found this review funny
281.8 hrs on record
Posted: August 25, 2015
This game WILL make you meet well-known people.

Example: I was watching this guy's video, after it ended, I decided to play some Synergy, I joined a random server, and the person who made the video was there.

Seriously my mind was blown away.
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14 of 16 people (88%) found this review helpful
5 people found this review funny
1,015.1 hrs on record
Posted: December 29, 2015
Funny to play the story with friends/random people or just troll :P

11/10
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