Dive into the zombie apocalypse with Zombie Panic! Source: a cooperative, survival-horror first-person-shooter. One of the most popular Half-Life 2 modifications of all time.
User reviews:
Very Positive (61 reviews) - 86% of the 61 user reviews in the last 30 days are positive.
Very Positive (4,168 reviews) - 91% of the 4,168 user reviews for this game are positive.
Release Date: Dec 28, 2007

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Community-Made Mod

This game requires that you own a Source engine game such as Counter-Strike: Source, Half-Life 2, or Day of Defeat: Source. Click here for a full list of games that meet this requirement. Please note that Portal: First Slice and the bundled Half-Life 2: Deathmatch do not fulfill this requirement.

Click here to learn more about mods on Steam.

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Half-Life 2 Mod


Recent updates View all (234)

September 17

Zombie Panic! Source coming to Source Engine 2013!

Hello Everyone,
Our team has some excited and long-awaited news to share with you! After years of delays and putting the development on hold many times, ZPS on Source 2013 is finally happening!
Before we get into the details of what this will mean for the game, we must introduce our newest programmer, who offered to do the port of SDK 2007 to the latest Source Engine version SDK 2013, and is willing to support ZPS even more: Jonnyboy0719, from BrainBread2! He has been doing outstanding work porting this game to a proper build, fixing up lots of old bugs, issues and critical glitches from the old engine and making this happen for us!

So let's get to the news and what this means for the community.

Source 2013 was released awhile ago by Valve, and we were working on a port already back in 2014, which would be the release of ZPS 2.5 that never went further because of delays and other problems that the team had to face.

Now, with this new engine running on our upcoming build, we're excited to introduce the following:

  • Better optimization, fixed memory leaks and multi-core rendering, making the game run smoother, faster and more stable, for both players and servers.
  • Proper Linux support for dedicated servers.
  • Fixes of old engine bugs and glitches that were causing the game crash or close itself.
  • Better Hit-registration and lag compensation.
  • Better Steampipe.
  • Working achievements.
If everything goes as planned, we'll be releasing these features in ZPS v3.0, along with other improvements, as soon as possible. For now, enjoy this small teaser, showcasing the alpha state of ZPS 3.0

Meet Pedro: our newest Survivor!
Pedro was in development for a long time back in 2011, by our 3D artist EArkham. He's a ex-drug dealer from Mexico before the apocalypse started, and we'll make you guys finally meet him in-game sooner than you think! Here are some previews of what he looks like:

New Engine means major changes!
Since this is a totally new engine port, basically rewriting the game from scratch, Jonnyboy will be doing his best to make everything work how it is supposed to be working in ZPS. However, like we mentioned above, some things had to be changed, which will affect some custom content that was compiled for the Source SDK 2007.

This will affect all of the custom maps and content as they will be incompatible with the new engine. The major changes on the port is a flip of the names/numbers that determine how your map reads the Teams (Human, Zombie and the Spec). Technically speaking, if any map running the entities: "filter_activator_team" and "func_ladder"; and was compiled in SDK 2007, it will be unplayable in ZPS 3.0 version.

But don't PANIC! yet. if you're reading this, are a community mapper and still active, then don't worry, the changes that have to be made are small and easy to do. We'll create a guide explaining how to do these small changes on your map, recompile it properly to be compatible and ready for the future release in no time! We're informing you now so that you have time to prepare but as we are not fully done with the build, other requirements needed to make maps work on the engine may be discovered. If so, we will inform you in due time.

New Upcoming Maps!
Speaking of maps, this update will include two old, popular community maps, made official: Zomboeing and FrozenHeart! Both objective, having lots of additional details and other changes that have improved the gameplay and look of the maps. We would like to thank Ratboy and Darb Dude for doing an amazing job on bringing back Zomboeing as an fully-fledged and incredibly entertaining experience!

And also, releasing bunch of maps improvements & fixes on other stock maps, introducing our first official Hardcore map, zph_pithole, by Xufe!

Improved Server Security - The days of malicious crashes are behind us.
One of the most important changes in this update is the solution to the age-old exploit that has been used to carry out server attacks for years. This behavior is not something we want to see carried over to the new build.

To help secure the community until the new build is ready, we've set up a Server Setup and Security threads. With the help of the community, their threads will help you secure your server to deal with the attacks to the best of the current engines ability.

When will this update roll out?
After all this information, you guys might be asking yourself: update, when!?
As we've mentioned, the build is currently in Alpha state, and our team is doing our best to bring you guys this update as quick as possible. The update is focused on bringing stability and security to the game, adding a bunch of new content is something our team wishes to do but we won't let it prolong the release date of this crucial update.
Future updates, that will introduce more new content and tweaks, will be shared with you as always through our announcements.

In the meantime, share these exciting news with your old friends through Steam, Facebook and even on Twitter! Tell them that ZPS is coming back in a more secure and stable state than ever seen before.
The next announcement will be the changelog of the ZPS 3.0 build. Looking forward to it! We sure are.

-ZPS Dev Team

128 comments Read more

August 18

Zombie Panic August Update

We've made some adjustments to the preview public beta and the recent maps update. Thank you to all who've been playing those official maps, reporting minor bugs to us and giving us feedback to help improve your experience even more. You can find those changes detailed below.

===== 2.4.1 August Update (08-19-2016) =====

  • Updated Store Page description.
  • Updated all .cfg files
  • Updated game tips.
  • Removed unused files inside the models and materials folders.
  • Added Brazilian translations.
  • Added Danish translations.
  • Added French translations.
  • Added German translations.
  • Added Swedish translations.
  • Updated Russian translations.
  • ZPO_harvest
    • Tweaked weapon spawns.
    • Fixed some decal issues.
    • Fixed few spot_light issues.
    • Added an easter egg.
  • ZPO_shreddingfield
    • *NEW*: Survivors can no longer go through the parking lot right away until they move to another street. (Breakable after that)
    • Fixed an issue with the last objective generator.
    • Fixed players being able to block the human spawn door.
    • Fixed players being able to block the supermarket exit door.
    • Fixed players being able to block the warehouse door.
    • Fixed a displacement error.
    • Tweaked random weapon spawns.
  • ZPS_asylum
    • Tweaked weapon and ammo spawns.
    • Fixed a displacement error.
  • ZPS_deadend.
    • Added an extra way out on the Zspawn closer to the school bus.
    • Added a breakable window inside the Church.
    • Tweaked weapon and ammo spawns.
    • Improved HDR lighting.
  • ZPS_keretti
    • Tweaked weapon and ammo spawns.
  • ZPS_nightmare
    • Added a few details around.
    • Tweaked weapon and ammo spawns.
    • Healthkit and Kevlar spawns nerfed.
    • Improved optimization.
    • Fixed an annoying ladder issue on a roof.
  • ZPS_policestation
    • Added more vehicles outside of police station.
    • Added fire smoke inside the police station.
    • Tweaked weapon and ammo spawns.
    • Fixed a displacement error.
    • Replaced some HL2 models.
  • ZPS_silence
    • Tweaked weapon and ammo spawns.
  • Added models/textures for the new survival map zps_sapidcerebrum.
  • Replaced weapon_spanner with a new pipe wrench model/texture.

This is not the map update that we promised you guys earlier. This is only a small patch to correct issues and add tweaks to the newly updated stock maps and game files. The next map update is still in the works.

This update will add changes to your cfg files so we recommend backing up your game commands and binds by creating a autoexec.cfg file. A basic on how to do this can be found here. When the update rolls out, replace your own .cfg file to the new one.

-ZP:S Dev Team

60 comments Read more

About This Game

Dive into the zombie apocalypse with Zombie Panic! Source: a cooperative, survival-horror first-person-shooter. One of the most popular Half-Life 2 modifications of all time.
Choose your team as the undead or a survivor. Enjoy their unique abilities, weapons, and challenges in this high-paced, action-packed thriller.

The Teams

As a survivor, unlock large arsenals of firearms, explosives and improvised melee weapons. Can you stop the waves of undead? Will you engage the horde head-on, or barricade and fortify while your friends play sniper? If all else fails, Panic! Then run as if your lives depend on it… for they surely do.

As a zombie, you’re free to hunt the living like the rabid beast you are. Feast upon their flesh and unlock your inner berserker. Heightened zombie night-vision gives you the upper hand in dark environments. Infect survivors as the carrier zombie (patient zero), to weaken their defenses, then sadistically watch them turn on each other. Use it all to your advantage to strategics, ambush, conquer and destroy your oblivious living counterparts.


Zombie Panic! Source hosts a variety of game modes for excellent replayability. Explore the zombie apocalypse with:

  • Survival Mode: Put your ability to scavenge and survive to the test. Easily the top player choice.
  • Objective Mode: You’re on a mission. Whether it’s to escape or defeat the horde, you’d better use your brainz to find those keys, get the power back on, hack that computer, and get to the chopper! Otherwise… I think you know what happens.
  • Hardcore Mode: For experienced zombie connoisseurs, you and your teammates get to enjoy pitting yourselves against extra tough foes, and even rougher odds.
  • Assault Mode: Capture the Point. Points are awarded for completing side objectives, adding to the overall score of the players’ team which in the end decides the victor.

System Requirements

    • OS: Windows® 7 (32/64-bit) / Vista / XP
    • Processor: 1.7 GHz Processor or better
    • Memory: 512 MB RAM
    • Graphics: DirectX® 8.1 level Graphics Card (Requires support for SSE)
    • DirectX: Version 9.0c
    • Network: Broadband Internet connection
    • Storage: 8 GB available space
    • Sound Card: DirectX 9.0c compatible sound card
    • OS: Windows® 7 32/64-bit
    • Processor: Intel Dual Core 2.4 GHz Processor
    • Memory: 2 GB RAM
    • Graphics: Video Card Shader model 3.0. NVidia 7600, ATI X1600 or better
    • DirectX: Version 9.0c
    • Network: Broadband Internet connection
    • Storage: 8 GB available space
    • Sound Card: DirectX 9.0c compatible sound card
Customer reviews
Customer Review system updated Sept. 2016! Learn more
Very Positive (61 reviews)
Very Positive (4,168 reviews)
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2,119 reviews match the filters above ( Very Positive)
Most Helpful Reviews  In the past 30 days
3 of 3 people (100%) found this review helpful
132.0 hrs on record
Posted: September 26
Zombie Panic Source is after all this years still the game that comes closest to the essential topic of a zombie game.
Especially in the last few years with Day-Z and the following boom of like-ish games this game was always something different.

ZPS gives you the unsettling feeling to never be safe, no matter how good you are equipped or how good your boarded up room is secured - ammo is limited, the dead are always on your back and the survivor you play with could have gotten infected in the last attack. And once you are gone you join the undead ( Romero true there are no special infected - only the hordes of the undead) and you can hunt down the guys who saved your ♥♥♥ just 2 minutes prior.

I had really a lot of fun in this game - and the fact that its still somewhat active after all this years ( in a time where game servers die after a couple of years) already says a lot.

And the best news is - a new team of devs started to work again on this game ( September 2016 ).
So if you look again through your hundreds of games in your libary and dont know what to play - just give ZPS a try.
It´s free and all you can lose is your interest for every other game for some time ;D
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
1 person found this review funny
68.0 hrs on record
Posted: October 2
This game is just wow i mean me and a friend had played this game a lot

First server
Church Skittles

Hide in the basement make a amazing barricade some guys get mad at me for locking them out so i watch that guy being eaten

10/10 would ♥♥♥♥ off 6 mexicans over my barricade and slowly say cant hop this wall
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
792.0 hrs on record
Posted: September 30
10/10 My most fav game i have ever played. Can believe how a free game like this is better than much other games that you have to pay for
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1 of 1 people (100%) found this review helpful
2.7 hrs on record
Posted: September 30
Hey there! :D
great game just a little bit boring that its old maps and not so mutch modes but still funny
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1 of 1 people (100%) found this review helpful
375.1 hrs on record
Posted: October 2
This was one of my most played games when i was younger, such wonderful memories.. met a lot of friends back then. But as the time has passed more and more people has stopped playing it, a sad thought really.
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1 of 1 people (100%) found this review helpful
26.0 hrs on record
Posted: October 4
That was cool... Give me back my 2007!
I've found this game on local torrent-tracker and downloaded it, because i was interested in zombie-shooters. It was really old version (Don't remember, but there was only one models for survivor and zombies), a lot of bugs, de-syncs on servers, but it was great! What a memories! L4D2? Pff, give me a break, not too interesting and intense, you don't scaring to die. NMRIH? Yeah, thats cool! But i want to play as zombie! So, ZPS still the best :)
Best regards to developement team!
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1 of 1 people (100%) found this review helpful
10.1 hrs on record
Posted: October 12
so ez i rekt evri skrub on dis gaem
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
114.8 hrs on record
Posted: October 5
ZP: Source is life!
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
3.4 hrs on record
Posted: October 8
After being convinced by my boyfriend to play this game, I will say, after giving it a shot I didn't expect to enjoy it as much as I did. With the very little hours I've put into the game, it was an exciting game overall. The survival and objective based maps are both a lot of fun and team oriented. If I had to choose between survival and objective based maps, I prefer the objective maps because it can be slightly repetitive with trying to hold out as long as possible when it comes down to you and another player, but not bareable at all. The objective maps are straight forward and you really got to stick together as a team to move forward with the map. The second your team's defense is broken, you definitely need to cover each other as much as possible or hall ♥♥♥ LOL. The game play is a lot of fun, it can get your adrenaline going, and the community is very well-rounded. I highly recommend this game to anyone who hasn't tried it out yet. You won't be disappointed.
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1 of 1 people (100%) found this review helpful
21.1 hrs on record
Posted: October 12
Love this game, got addicted thge first time i played and no have some 20 odd hours invested, love the concept of playing as both survivor and zombie, laugh everytime someone rage quits.
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Recently Posted
4.9 hrs
Posted: October 21
Helpful? Yes No Funny
0.8 hrs
Posted: October 21
This game is Creepy! Fun! Exsiding! (srry the mispell) and tense! my computer broke and i had to un install everything, but once i get a chance, im re-getting this!
Helpful? Yes No Funny
1,104.9 hrs
Posted: October 20
I been playing Zombie Panic since the first release when i was a little 8+ years ago,
Super excited when Zombie Panic Source released in 08'
This game offers quite some realism towards the typical slow zombie survival.
Has survival maps and objectives maps with a variety of weapons, guns, props and explosives.
Best zombie game although the community has been dying as the days go by.
Helpful? Yes No Funny
Unlawfull Potato
0.3 hrs
Posted: October 20
very fun game cant stop playing
Helpful? Yes No Funny
☢e621☢ Eclipse
9.6 hrs
Posted: October 19
If you can provide ZPS, valve game assets to use via any means, then you got a fun, graphically light, zombie game without any extra charge.
Helpful? Yes No Funny
10.9 hrs
Posted: October 19
I never wrote a review for this? Erm, I see.

Well yeah, you guys should play this.
Helpful? Yes No Funny
Zenako Kirigaya
118.8 hrs
Posted: October 19
Play this game that is all.
Helpful? Yes No Funny
333.5 hrs
Posted: October 17
This game is Creepy! Fun! Exsiding! (srry the mispell) and tense! my computer broke and i had to un install everything, but once i get a chance, im re-getting this!
Helpful? Yes No Funny
0.5 hrs
Posted: October 17
Helpful? Yes No Funny
109.2 hrs
Posted: October 15
One of the best Half life 2 mods
Helpful? Yes No Funny