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 (2,079 reviews)
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.

Play Synergy

Half-Life 2 Mod

 

Recommended By Curators

"(Mod) This is a Must if you like the half-life games. All singleplayer campaigns are now multiplayer & better than ever. Black Mesa Source comming soon!"
Read the full review here.

Recent updates View all (33)

May 28

[Weekly] Time to say hello again. 56.13

Not many updates this week. There isn't a current
changelog for the new 56.13 of synergy.

There have been some new added features which are still a Work in progress.

For instance the shell casings update not many have noticed yet but if you shoot the smg1 or shotgun you will see that actual physics shell casings come out and hit the floor just as a normal shell casing should. They can be stepped on and moved around (client side)


Also donators have a new addition to their playermodel selection



Come back next week for the next news post

6 comments Read more

May 22

Keeping it simple and updated

As posted on

Just a heads up. We'll try our best to keep you guys updated as much as possible.
Our coder has thrown a few updates in the past week that fixes a few issues (no changelog for that),
As you know we barely post news and updates on what's going on. We'll try to keep our changes in order.


Rebel rush event is not yet scheduled. I will keep you posted.

Every week I or another team member will be posting some updates/changelogs.
Just to keep you guys in the "know".

Thank you so much for being a part of Synergy till this very day.
We hope to release some crazy new things very soon.




17 comments Read more

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
68 of 68 people (100%) found this review helpful
3 people found this review funny
9.9 hrs on record
Posted: January 2
When 15 of the one and only Gordan Freeman run into a hallway and simultaneously get whacked unconcious by the same cop, you know it's gonna be a good game. You start your journey by cooperatively breaking the mini teleporter in Kleiner's lab faster than a 10 year old on xbox live can realise when his internet has just cut out. Proceed to race your fellow chums to numerous respawning copies of the same laser mounted airboat before you have to wait in line with nothing but the sound your crowbar makes when it hits other players to entertain yourself. Stomp all over that antlion awaking sand because you brought an army this time and no one gives a ♥♥♥♥ about whether or not that rebel loser's friend is gonna get killed due to your lack of self reserve. Get vaporized at least 50 times in the combine elevators from violent swarms of electric balls launched by your cackling comrades. Lastly, break the shock and awe that resides in the silence of the game's final, time stopping, life endangering, jaw dropping, moments with a subtle "sometimes I dream about cheese" sounded off by using your keen dialogue wheel. 99/10, A player took out a whole server with an explosive barrel and followed it up by singing the national anthem.
Was this review helpful? Yes No Funny
38 of 38 people (100%) found this review helpful
14 people found this review funny
18.3 hrs on record
Posted: March 31
Pick up that can: Now with friends
Was this review helpful? Yes No Funny
23 of 26 people (88%) found this review helpful
1 person found this review funny
3.7 hrs on record
Posted: February 26
Synergy is not a game, Synergy is a mod for a couple of games that allows you to play Online.
I played Synergy with my best friend, Origibro, here on steam.
I enjoyed it very much, we played Half Life 2, we started from the beggining of the game.
Everything is same as playing in Single Player, only is that it's alot better playing with a friend or two.
I hope I continue playing this awesome mod, and I hope my friends want to play it with me as well!

My Rate: 11/10 Awesome.
Was this review helpful? Yes No Funny
13 of 13 people (100%) found this review helpful
14.4 hrs on record
Posted: December 16, 2014
Nothing like getting a bunch of friends to hop in the back of a truck on the coast and then speeding around in a mad antlion massacre.
Was this review helpful? Yes No Funny
14 of 15 people (93%) found this review helpful
1 person found this review funny
25.1 hrs on record
Posted: December 13, 2014
wet dream/10
Was this review helpful? Yes No Funny
11 of 12 people (92%) found this review helpful
1 person found this review funny
3.2 hrs on record
Posted: December 3, 2014
When I found this I was so happy because i could play all my favourite valve games with my friends. thanks random people who made this!!!! ='D
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11 of 12 people (92%) found this review helpful
2.3 hrs on record
Posted: February 2
This is a must have for fans of Half-Life 2!

To put it short, this is a mod that let's you play Half-Life 2, Half-Life 2: Episode 1, and Half-Life 2: Episode 2 and let's you play it co-op!

How is that not awesome?!

If you have Half-Life 2 GET THIS NOW!
Was this review helpful? Yes No Funny
9 of 9 people (100%) found this review helpful
1 person found this review funny
12.6 hrs on record
Posted: February 6
Basically, Half Life 2 Coop
Was this review helpful? Yes No Funny
10 of 11 people (91%) found this review helpful
1 person found this review funny
10.0 hrs on record
Posted: February 16
A Half Life 2 coop mod its free and very awesome.
Was this review helpful? Yes No Funny
8 of 8 people (100%) found this review helpful
1 person found this review funny
48.6 hrs on record
Posted: December 20, 2014
Strapped for cash? Want to play something that is fun?

Get a copy of HL2, and grab this.

You certianly won't regret it.

It's a free mod for HL2 that adds co-op, a few weapons and slight gameplay changes that don't alter the original gameplay too much.

9/10
Was this review helpful? Yes No Funny
8 of 8 people (100%) found this review helpful
1 person found this review funny
1.5 hrs on record
Posted: April 24
Half life 2 multiplayer mod Makes Half life something else
10/10
Was this review helpful? Yes No Funny
9 of 11 people (82%) found this review helpful
2 people found this review funny
59.2 hrs on record
Posted: December 28, 2014
ayy lmao
Was this review helpful? Yes No Funny
6 of 7 people (86%) found this review helpful
1 person found this review funny
15.0 hrs on record
Posted: January 21
Get smacked around for a while by tasers and take no damage. 10 minutes later it's a one hit.

10/10 would get pushed by a npc and get ditched by my friends again
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
10.8 hrs on record
Posted: December 21, 2014
An awesome mod for half life 2
gj who ever made it
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
1 person found this review funny
2.6 hrs on record
Posted: January 19
robbed a bank and furiously wanked to a gnome 10/10
Was this review helpful? Yes No Funny
4 of 5 people (80%) found this review helpful
1 person found this review funny
2.0 hrs on record
Posted: December 18, 2014
Fun in a pickled jar
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
1 person found this review funny
1.7 hrs on record
Posted: January 29
I am lazy so my rating just get it.... out of just get it.....
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2 of 2 people (100%) found this review helpful
25.3 hrs on record
Posted: January 9
Well what do I have to say about this mod. Well I problaby the best half life mod out there Its a co-op mod FOR HALF LIFE what more could you want, add they have also added in mechanics especially for co-op. If your looking for a game/ games
look no more beause here it is

Well my final verdict for this mod
10/10
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2 of 2 people (100%) found this review helpful
85.7 hrs on record
Posted: December 18, 2014
It's a great mod, really fun when you bring a couple friends along the ride. However, one complaint of mine is that the mod made the enemies really tough, and you really weak. If there's only two players, they're gonna be dying constantly, especially in the sections where you have to hold out. Setting the difficulty to easy does not help against that one bit, and it's overall really frustrating. So as i said before, i recommend you play with more than several people, otherwise you're not gonna have a good time.
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2 of 2 people (100%) found this review helpful
8.0 hrs on record
Posted: December 29, 2014
If you liked Half Life or Half Life 2, Synergy allows you to play through Half Life 2 with your friends in co-op mode which me and my mates found hilarious, especially if you've already completed the game and want more replay from it.
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