Available for Free

The basic idea of Zombie Panic! Source is to create a solid gameplay that is based on a classic zombie outbreak scenario. The living dead are coming for the last remaining humans, and these survivors must fight them off and live through the day.

The game works like this:

At the start of each round, players can either choose to join the human team or volunteer to be the first zombie. If no one volunteers the game will pick one human randomly, and the game begins! The starter zombie's goal is to kill the humans while the human goal is to stay alive as long as possible, complete objectives, or even wipe out all the zombies. The catch is that when a human dies he will simply join the ranks of the undead, now ready to finish off his old living teammates. The humans can't tell by the player list who is alive and who is undead.

Eventually, there will only be one survivor still standing if everything goes wrong, his back against the wall while facing the animated corpses of his former allies. In a survival round, the zombies team only has a certain number of reinforcements (lives), and when a zombie is killed they lose a life from the counter. However, when a human is killed they gain 1 life. When the zombies run out of lives, the remaining survivors win the round by killing off the remaining undead left on the map. In objective rounds, zombies get an unlimited number of lives while the humans must complete a variety of map-based objectives to win.

Human abilities and advantages:

  • Speed - A zombie can only run at about 80% of the top speed of a human player. Though, the more weaponry and ammo a human picks up, the more it will slow him down, making him an easy target for the undead. If they are carrying nothing, a human can easily outrun a zombie. Watch out so you don't get cornered...
  • Weapons - The humans have a wide selection of weapons to use for defending themselves, like firearms, explosives and melee weapons. It is essential for humans to locate weapons and ammo around the map in order to survive, since they only spawn with a random melee weapon and handgun scavenging is a must. Remember that inventory space is limited and hogging weapons will merely slow a survivor down, so sharing with teammates is a must!
  • Numbers - At the beginning of the round, there are only from 1-3 zombies, depending on how populated the server is. Everyone else is a survivor. This means that they can easily watch each other's backs and provide cover fire. However, once their ammo starts to run dry and they begin to squabble amongst themselves for the few precious clips of ammo available.
  • Communication - Instead of typing messages to each other (occupying busy hands), which can be really dangerous when the zombies are lurking in the shadows, the humans have the ability to communicate by voice commands. There is a menu with several commonly-used commands that can help the survivors to organize a defense, trade ammunition and request help.
  • Panic! - Drop everything but what is in your hand and flee! This grants a temporary speed boost, allowing for a quick getaway, but use it wisely. More often than not, panicking just staves off a survivor's inevitable doom.

Zombie abilities and advantages:

  • Regeneration - Over time, zombies regenerate hit points, making it more difficult for survivors to make the undead dead.
  • Carrier - The first Zombie of the round differ a lot from the other undead - he looks different, sounds different, and has abilities that the average zombie can only dream of. He is the Carrier! With the power to infect people (10% infection chance per hit by default), he will cause panic and paranoia amongst the living. He also has the ability to roar, summoning other zombies to his aid.
  • Persistence - Zombies might seem to die often, but they won't give up. They just keep re-spawning over and over until your pistol runs out of bullets, your back is to the wall, and there is no escape.
  • Numbers - Later on in the game, as the undead ranks swell with a fresh dead, the last few humans will find their superior weaponry of small comfort for the hordes of zombies closing in.
  • Zombie Vision - Zombies can't use flashlights, so they have the ability to use Zombie Vision. Z-vision works in a way that it brightens up any possible light source in a room to make it more viewable. More importantly, when humans get tired, they start to glow blood red, making it easier for a zombie to track their prey. To prevent games of hiding and seek a survivor who just sits still will also start to glow red through sheer terror of the unknown.

We want the game to feel creepy and give you a sense of desperation, and yet not take itself so seriously that you can't laugh at the way you just died. Overall, fun and playability is the priority, and while realism and horror are important, those things are just a bonus when possible. We want a game that you can easily play with groups of any size, even with small or uneven numbers. Plus, there's a certain sense of satisfaction in tearing apart those heartless survivors who failed to protect you while you were alive, limb from limb.


See you there!

-Zombie Panic! Team

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RSS Articles

Christmas Carrier

Howdy, everyone! We're shipping another game patch fixing a lot of bugs and potential server crashes from the previous version, along with full Steam Workshop support and an additional Christmas theme! It's a small gift from us, the developers, to you all at the community who have been doing a wonderful job giving us valuable feedback about v3.0 update.

Improved Workshop Support

With our new Workshop support, servers will be able to send their installed addons to the players that are joining for the first time. This will force the players to install the required Workshop items so they are able to play on the server. Our Workshop Downloader will automatically update, download, or verify if the user has the required addons installed. Take a look on how it will work at the following video below:

Download the new Christmas Update on Steam now!



  • Updated Zombie Panic! Mod Tools


  • Added full workshop support
  • Added cl_scootinvenory
  • Added ent_merge
  • Added sv_event_halloween
  • Added sv_event_christmas

  • Added new vote convars:
    • sv_vote_creation_delay
    • sv_vote_bantime
    • sv_vote_admin_only
    • sv_vote_enable
    • sv_vote_enable_gag
    • sv_vote_enable_mute
    • sv_vote_enable_ban
    • sv_vote_enable_kick
    • sv_vote_enable_map
  • Updated the client prediction
  • Updated player selection screen
  • Fixed where you could drop infinite armor
  • Fixed the mouse would flicker when ZPS was minimized
  • Fixed FMODex not muting itself when out of focus
  • Fixed the weapon weight reading the wrong values
  • Fixed where the player wouldn't use the weapon_carrierarms if the carrier left the game, and the player became the new carrier
  • Fixed where spectators could respawn as zombie if the zombie lives reached 0
  • Fixed late joiners spawning as zombie, didn't eat up zombie lives
  • Fixed where the round wouldn't end if the last survivor died
  • Fixed map spawned ammo would merge with each other
  • Fixed crouch jumping causing players to get stuck in ceilings
  • Fixed the backpack not being drawn when it should on Objective gamemode
  • Fixed zombie arms not being able to push props when inside teammates
  • Fixed where props producing the wrong sound when scraping on the floor
  • Fixed an exploit where the last zombie could infect a random player by leaving the server, if there were no lives left


  • Added SetVoice
  • Removed hook OnPlayerInfectedCompleted
  • Updated hook ClientConnectedToServer
  • Updated hook OnPlayerInfected (now checks if infection is completed)
  • Updated the API


  • zpo_aquatica
    • Added a delay to the zombie toilet spawn, 3 sec if 4 zombies, 5 sec if 5 and over
    • Trigger_push at elevators are bigger
    • Made the 8 plants at the ocean entrance static
  • zps_town
    • Fixed issue of static doors glowing.
  • zps_thrillvile
    • Saved 206 edicts
    • Minor door fixes
    • Added AS Limit scripts
  • zps_sapidcerebrum
    • Added AS Limit scripts
    • Ladder fix
    • Fixed cubemaps & textures
  • zps_haunted
    • Fixed issue of static doors glowing
  • zpo_harvest
    • Added human clip on doors and windows of the house until they blow up the basement tunnel.
    • Fixed height of two middle wood barricades in the basement.
    • Tweaked ammo spawns on the barn +18 humans.
    • Moved up weapon_barricade to the second floor in the barn.
  • zpo_subway
    • Fixed the filter on the keycard so zombies don't earn points from using it.
  • zpo_frozenheart
    • Improved optimization
    • Made few props movable on garage and break room.
  • zph_pithole
    • Lab-Stair Section is now easier (less toxic waste)
    • The Super long route should now work (more) correctly
    • Reverse Round should work (more) correctly)
    • Added more ammo/weapon/misc items for survivors.
    • Replaced the drainage pipe grates with doors
    • The closeable gate zombie spawn now has a breakable section so zombies can free themselves.

Christmas Menu

We hope you enjoy this special gift.

Merry Christmas!

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- Zombie Panic! Source Development Team

Ushering In A New Era, v3.0 Is Live!

Ushering In A New Era, v3.0 Is Live!

News 8 comments

It has been a long road, with a lot of obstacles and trials. Zombie Panic! Source v3.0 is finally out! Our team could not have foreseen the enormous amount...

Reviving the Community and Prepare for v3.0 Release!

Reviving the Community and Prepare for v3.0 Release!

News 4 comments

We hope everyone's as excited as our team is, as we're only 4 days away from the release of v3.0! We're working hard on the final polishing of the build...

v3.0 Has A Release Date! And It’s the Biggest Update Yet

v3.0 Has A Release Date! And It’s the Biggest Update Yet

News 16 comments

We’re happy to finally be able to announce that the v3.0 update for Zombie Panic! Source will be released on the 8th of December, this year! We've so...

Summer Development Progress Update

Summer Development Progress Update

News 10 comments

Like our last announcement, we have so much to discuss about our development progress and what we've done the past few months. While our main priority...

RSS Files
WorkHazard OST

WorkHazard OST


Pithole (WorkHazard) OST made by our sound designer KaempeLaeske

Zomboeing OST

Zomboeing OST


Zomboeing OST made by our sound designer KaempeLaeske.

FrozenHeart OST

FrozenHeart OST


FrozenHeart OST made by our sound designer KaempeLaeske.

ZPS - Horde

ZPS - Horde

Music 2 comments

New Zombie Panic: Source ambient track "Horde" - By KillahMo

ZPS - Barricade System

ZPS - Barricade System


Zombie Panic: Source v1.5 will introduce the ZPS Barricade System. Here is a short preview of it in action. (Note: The HUD display is not visible in the...

ZPS - Descent

ZPS - Descent

Music 1 comment

New Zombie Panic: Source ambient track "Descent" - By KillahMo

Comments  (0 - 10 of 2,920)

Holy crap! You guys are still alive!? I'm astounded that you've been able to pull through since 2009!

Reply Good karma Bad karma+1 vote

Wow, you guys left out Win XP, that's sad...

Reply Good karma Bad karma+2 votes

Will you add any Weapons that were in Contagion into ZP:S?

Like the Bows and Rifles?

Or are you gonna stick with what you already have?

Reply Good karma Bad karma0 votes

Holy crap, I had no idea this was still being updated. I used to be super involved with the forums way back in like 2009, making maps and stuff. Maybe I'll download ZPS again and see if people are still playing on Cabin. The worst map.

Reply Good karma Bad karma+2 votes

do you accept donations ?

Reply Good karma Bad karma+1 vote
Tabajara77 Creator

We're not accepting donations. It's a free mod. Only way to support us is sharing this mod with your friends!

Reply Good karma+1 vote

Wow guys, amazed to see you still working at this. It was one of my favourite Half Life 2 mods. Thank you for some awesome memories and good luck!

Reply Good karma Bad karma+6 votes

Amazed to see this mod is ALIVE and not dead like so many others

Follow through!

Reply Good karma Bad karma+3 votes

And of course, the port over to Source 2013 is a fantastic step in this Mod's direction and opens up new opportunities in the game itself; I'm more excited to be receiving a new character after such a extended while, but all in all, thank you for your contributions to this Mod after so many years Community Members.

Reply Good karma Bad karma+5 votes

im crying now, you guys are still alive

Reply Good karma Bad karma+3 votes
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1246 votes submitted.

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Highest Rated (13 agree) 10/10

Well...this is the greatest HL2 mod I've ever play! and i hope you guys can keep your hard works on the new mod! it looks awesome!

Dec 15 2010 by oceaneyes


Latest tweets from @zombiepanic_dev

RT @MedievalGinger: Zombie Panic: Source was probably one of the funnest zombie multiplayer games I’ve played. Was always funny barrica… T.co

Feb 6 2018

Appreciated your kind words! Cheers! T.co

Feb 2 2018

We've shipped a new Zombie Panic! Source update featuring a bunch of game balance tweaks, bugs & maps fixes, and mo… T.co

Jan 31 2018

Sweet news as always! T.co

Jan 30 2018

RT @nmrih: We've just released our 1.09.7 update for No More Room in Hell live on steam! There's a number of new official and… T.co

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We'd like to share some interesting graphs about how the v3.0 update handled its first release date to Steam and wh… T.co

Jan 11 2018

RT @ModDB: The Zombie Panic! Source mod for Half-Life 2 has launched v3.0 - see all the new features here… T.co

Jan 2 2018

RT @ModDB: It’s time to announce Players Choice - Mod of the Year winners for the 2017 Mod of the Year Awards! These winners w… T.co

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