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 (74 reviews) - 94% of the 74 user reviews in the last 30 days are positive.
Overall:
Very Positive (3,012 reviews) - 94% of the 3,012 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! Learn more
Recent:
Very Positive (74 reviews)
Overall:
Very Positive (3,012 reviews)
Recently Posted
Chris Hansen from Dateline NBC
( 13.1 hrs on record )
Posted: June 29
hey, that is pretty adequate
Helpful? Yes No Funny
ACG | JeyCee
( 17.8 hrs on record )
Posted: June 28
A really fun mod to play yourself and with friends. Its more difficult than the regular Half-life 2 games. Don't know why this mod makes the game difficult cause my friend set the game difficulty for us on easy and its still difficult to fight against our enemies. But either way, the mod is fun. 7.5/10 :D
Helpful? Yes No Funny
Blueberry
( 23.0 hrs on record )
Posted: June 28
I could play Half-Life 2 with my co-op with my friend friend without any problems. Awesome.
Helpful? Yes No Funny
LunaRTKH_
( 41.9 hrs on record )
Posted: June 27
It's fun to play with other peeps, made some friends. But unless you know who to play with, I wouldn't reccomend.
The community is dead, you'll be lucky to find a server with more than 1 or 2 people on it. There's nearly no servers, you'll find more people playing sven coop
Helpful? Yes No Funny
-Sexylegs.
( 12.9 hrs on record )
Posted: June 25
like thredbo's slogan, i like it.
Helpful? Yes No Funny
Liviu222
( 7.4 hrs on record )
Posted: June 25
is hl2 but co-op so 10/10
Helpful? Yes No Funny
TheJudoRabbit
( 2.2 hrs on record )
Posted: June 25
Unfortunately the community for this game is dead, but if you have friends and Hamachi (Which is free, just google it) it's all good.
Helpful? Yes No Funny
Spartan Ghostface
( 8.7 hrs on record )
Posted: June 24
its like sven co-op but you can replace father grigori with a plauge doctor and replace combines with the HECU and replace defualt male and female playermodels with some metrocops from the metrocop pack


seems legit/10
Helpful? Yes No Funny
mahyar_mk
( 18.1 hrs on record )
Posted: June 24
good game
Helpful? Yes No Funny
Most Helpful Reviews  In the past 30 days
22 of 33 people (67%) found this review helpful
1 person found this review funny
Not Recommended
10.4 hrs on record
Posted: June 19
I feel like people in this game who reviewed it, did it with obvious hollow bias. Most of the reviews say "It's good, I can play with friends" and such, but none of them go into detail of the games current state.

For starters, the community is practically dead. You'll only find about 50+ servers, with a total of about 12 people, the most in one place you'll find is 2 or 3. Even Sven Coop, the game's predecessor, has far more people playing.

The developer has Soon™ syndrome. Yes, I know he's working on Black Mesa Source and other games, I'm not bashing him. But I’ve seen it several times on the forums where he promises an update, only for it to never be announced. The last time he said anything publicly outside of the forums was May 28th, 2015. It's been over a year since content has been updated.

Combine are insanely overpowered; Weapons have been nerfed. The SMG1 is the most notable. In HL2, you could take the SMG 1 most of the game and it would do. In Synergy, the SMG1 is a pea shooter that can barely kill metro police. The Combine have been mega buffed; they take forever to kill (Even with the new LMG). They'll gun you down in seconds and you'll even be lucky if you manage to harm one considerably.

Most of the built in maps are outdated and near impossible to beat since there is no checkpoints. You die, that's it. No setting can change that. Since the maps aren't built around the Combine Weapons changes, you'll be lucky if you even get past any level with combine.

The modding community is scarce, barely any mods and they're not very diverse. You can't add player models unless you're a donor, and the only way you can become a donor is if you donate, but you have to wait until the next update for perks. And with a developer suffering Soon™ Syndrome, the approximate time you'd get perks is between now and when Half Life 3 is released. Most of the mods were ripped or stolen directly from Gamebannana, and you could easily make your own just by renaming a few files and swapping things around and then just plopping it in the custom folder like it's nothing.

I'm not trying to stomach punch the game or the developer. But people should know the truth instead of hearing the bias in these recent reviews. All I see is "The game is gud I can ply with friendz" or generic copy pasta. I hope this game gets revised and revived somehow, at some point. Because if the games predecessor, Sven-coop is doing better than its successor, then there's quite an issue, isn't there?

If you really want a source engine coop game, I'd suggest Obsidian Conflict. Sven-coop if you're on a potato.
Was this review helpful? Yes No Funny
7 of 9 people (78%) found this review helpful
Recommended
19.2 hrs on record
Posted: June 3
It's a lot of fun to replay the HL:2 series with friends as well as strangers. It's like playing it all over again in a new way. Nobody gets left behind because there is a required amount of people before it will progress to the next level, depending on the amount of people present in the game.
My only gripe (a major one) is that there is hardly ever someone actually playing the game. I resort to having to play with Steam friends, which isn't a problem. But if they arn't online, good luck finding a game with more than 2 afk people. Great game/mod, highly recommended if you havn't played HL2 in a while!
Was this review helpful? Yes No Funny
9 of 13 people (69%) found this review helpful
3 people found this review funny
4 of 5 people (80%) found this review helpful
Recommended
11.2 hrs on record
Posted: June 5
This is awesome! It lets my friend, my brother, and I to all play Half Life 2 together! They were reluctant to play it in the first place, because they thought it would be boring w/o someone to play it. You should add support for the Black Mesa mod!
Was this review helpful? Yes No Funny
3 of 4 people (75%) found this review helpful
1 person found this review funny
3 of 4 people (75%) found this review helpful
Recommended
0.7 hrs on record
Posted: June 17
really helped me to play with meh friends woowowowowowow wooot
Was this review helpful? Yes No Funny
3 of 4 people (75%) found this review helpful
1 person found this review funny
Recommended
13.3 hrs on record
Posted: June 6
Have fun fighting the Combine and Zombies with your human brothers.
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1 of 1 people (100%) found this review helpful
Recommended
1.5 hrs on record
Posted: June 18
Hafe life 2 with muliplayer!!

This Mod is great!!!!!
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
1 of 1 people (100%) found this review helpful
Recommended
4.8 hrs on record
Posted: June 12
It's pretty fun playing the story in co-op. It creates new possibilities to screw around. There are more alterations than I thought: Walls to prevent getting seperated, respawning near your companion, not requiring everyone to get to the level exit, more enemies, more recharge stations and so forth.

The controls are a bit lagging which makes it hard to manouver the hovercraft or shoot with it. The fight against the helicopter is unfair and a total lacklustre, because you are getting in the crossfire easily and die every 10 seconds.

Don't try to create a new server, take an existing one.

I don't care for the multiplayer deathmatches.
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