Situation Outbreak is an Orange Box mod about the impending zombie apocalypse.

Armed with nothing but a 9mm and a pair of brass knuckles, you must do whatever it takes to survive against the thousands of zombies that used to be your friends and neighbors. The cost of failure is nothing less than your free will.

There are no heroes. No single person can save the world and there are not enough bullets to go around. The only thing left to do is to kill the damned, hoping that you don’t end up like them.

This is not your average, run-for-your-life zombie mod. Quickly, here are a few things that set us apart:

  • Custom dynamic difficulty and ambient sound systems that adjust gameplay in real-time according to map toughness.
  • Seven awesome gamemodes, like Holdout and Extermination.
  • A completely new arsenal of custom weapons – all developed in-house by Agent Red Productions.
  • Survivors can buy weapons and ammo by cashing in points they earn for killing Undead and zombie NPCs.
  • Gain experience and level up to obtain useful bonuses and powerups.
  • Fight off hordes of zombies by hunkering down behind a barricade or going rogue.
  • Make your own maps using our fully-developed, easy-to-use custom entity set and in-depth tutorials.

We pride ourselves on being the most active zombie-based mod on the Source scene; new updates are being released just about every month!


The Agent Red Productions team is currently working on our latest project, Lethal Stigma.
Check us out @ and


One player is chosen to become the host of the zombie infection - and must infect the rest of the players by tearing into their tasty flesh! This is the classic outbreak style of gameplay. Either the zombies rule the earth, or the humans retake what was theirs!


Survivors must defend themselves against the hordes of zombies NPCs for a specified amoutn of time. Be sure to keep the zombies off your back - once you go down, you're not getting back up.


Survivors only have a few minutes to escape before being overrun by zombies! No one must be left behind! One player is chosen to be the host of the infection at the start of the round. Better hurry, zombies don't raise themselves!


Similar to Survival, Survivors will find themselves defending their fellows against wave after wave of zombie NPCs. However like Escape, there's a twist: the Survivors must also defend a specified holdout area until time runs out. Therefore the mission is not only to survive the infection, but to contain it, which makes this gamemode notably harder than the others.


Often deemed an Infection-Survival hybrid, one player is chosen towards the start of each round to be the zombie overlord. As a zombie overlord, a player is capable of killing Survivors for points either by using their zombie claws or by spawning their own army of zombie NPCs to command. These points can then be exchanged to spawn even more zombie NPCs. If a zombie overlord is ever killed during the middle of a round, they are spawned as a Survivor and another zombie overlord is chosen to take their place. This continues until a zombie overlord successfully destroys the human race or until time runs out, in which case the Survivors win.


Often deemed a Escape-Survival hybrid, Survivors must complete a set of objectives before they can escape to safety with the additional twist of having to defending themselves against endless waves of zombie NPCs. If the Survivors fail to complete all of their objectives before time runs out, they lose, making this gamemode the most versatile and open-ended as far as what objectives the Survivors are assigned to complete. As an added challenge, players never respawn once they are killed.


At the beginning of the zombie apocalypse when there was still organized government, the Military was willing to do anything and everything it could to prevent the spread of the infection - even if it meant killing their own citizens. This fast-paced, epic deathmatch-style gamemode pitches the Survivors against the Military. Anything goes, and ultimately only one force can come out on top.


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After five glorious years of developing modifications for the Source engine, the last year of which we’ve been largely inactive, it is with a heavy heart I announce the official closing of Agent Red Productions. Work on all projects, new and old, have ceased indefinitely. Our website will still be up for a couple more months until the domain name expires, but with limited to no support.

I hope this hasn’t come as a shock to anyone. That said, I do apologize that we were not able to finish the projects we set out to complete. Ever since Lethal Stigma’s development team all but disappeared and Half-Life 2: Retaliation’s development came to a close following an unfortunate data loss incident, our studio has had little to no in-house support, only retaining a core few active members along the way. It has always been my intention to complete development on Situation Outbreak 2, and I believe there’s still plenty of room for improvement with Contingency, but we simply do not have the resources to see those projects through at this time, nor have we for the past year. Perhaps one day they’ll see the light, but in the meantime, we cannot continue.

I want to personally thank everyone involved in the development of all of our mods throughout the years, regardless of contribution or commitment. We could not have gotten as far as we did without you. I would also like to thank everyone who has supported us and played what we’ve produced, especially those who have been with us since our inception. Our projects were always made for you, the community, and so we sincerely hope you’ve enjoyed them.

If you have any final comments, questions, suggestions or concerns for any of us here at Agent Red Productions, please email me at and I will get back to you as soon as possible.


James Pizzurro
Co-founder of Agent Red Productions

Join Us On August 29th!

Join Us On August 29th!

News 10 comments

On August 29th, and us will be playing Situation Outbreak and having a great deal of fun!

Official ARP Server Online & New Website

Official ARP Server Online & New Website

News 2 comments

Due to popular demand, ARP is now hosting an official server for Situation Outbreak. We've also got a new website for all of our past, current and future...

Source Code Released

Source Code Released

News 4 comments

A full release of Situation Outbreak's source code is now available for non-commercial use. Download away and put it to good use!

Development On Hold

Development On Hold

News 9 comments

Agent Red Productions is taking a bit of a break from developing Situation Outbreak while we focus our efforts on our latest creation, Lethal Stigma...

Add file RSS Files
Situation Outbreak - v1.61 Source Code

Situation Outbreak - v1.61 Source Code

Full Version 7 comments

A full release of Situation Outbreak's source code available for non-commercial use and open for the Source modding community to use.

Situation Outbreak v1.61 (FIX)

Situation Outbreak v1.61 (FIX)

Patch 15 comments

Only download this if you have already successfully installed Situation Outbreak v1.61 on your computer.

Situation Outbreak v1.61 (FULL)

Situation Outbreak v1.61 (FULL)

Full Version 29 comments

This installer is only for those who DO NOT have Situation Outbreak installed on their computer.

Situation Outbreak v1.60 to v1.61 (PATCH)

Situation Outbreak v1.60 to v1.61 (PATCH)

Patch 4 comments

This installer is only for those who already have Situation Outbreak v1.60 installed on their computer.

Situation Outbreak v1.61 Dedicated Server (FULL)

Situation Outbreak v1.61 Dedicated Server (FULL)

Server 14 comments

This installer is only for those who DO NOT have a Situation Outbreak Dedicated Server installed on their computer.

Situation Outbreak v1.61 Dedicated Server (PATCH)

Situation Outbreak v1.61 Dedicated Server (PATCH)


This patch is only for those who already have a Situation Outbreak v1.60 Dedicated Server installed on their computer.

Comments  (0 - 10 of 2,429)

Can somebody Greenlight this mod to steam?
So everyone can enjoy the Zombie Player Vs. Survivor Player mode. ;3

Reply Good karma Bad karma+2 votes

Is this dead?

Reply Good karma Bad karma0 votes

Wow, a year since my first comment.

You guys should reboot.

Reply Good karma Bad karma+1 vote

This mod should have at least 1 server to play on but still this mod is really good

Reply Good karma Bad karma+2 votes

this mod is reay awasome, wish it had over 100 players. me and my friend realy played this mod ALOT and i can say 9/10 few fixes and adds and it could be the best mod i played... :D

Reply Good karma Bad karma+1 vote

Putting up a server now

Reply Good karma Bad karma+3 votes

I'm getting an invalid steam userid ticket when I try to play, anybody got any ideas on a fix?

Reply Good karma Bad karma+1 vote

if you still have the problem just go into program files (x86) or normal program files and click steam and then delete the Config folder. when you start steam it will send you a message like your joining steam again at first. It will send you an email and you will need to enter a code to get into your steam acc, this gives you a new id ticket. hope i helped!

Reply Good karma Bad karma+2 votes

Why do all the triple-A mods get cancelled...

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jamespizzurro Creator

Well, in our case, there were two primary factors:

1) More than half our original development team ceased working on the project around v1.5, which made things extremely difficult for those of us who stuck around.
2) We never really had the player base we were hoping for, so in the end, the motivation to continue simply wasn't there.

Reply Good karma+1 vote

Yeah and other things like school, work, etc get in the way.

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619 votes submitted.

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Highest Rated (3 agree) 8/10

The mapping could use some work, so do the models, gun models, sounds.


And for multiplayer play, delete those ghosts, no one likes them.

Jan 4 2010 by AUG_DUDE


Latest tweets from @agentredprod

Our official website has shut down indefinitely, but you may continue to visit us on ModDB or at my new website,...

Nov 1 2012

It is with a heavy heart that I announce the indefinite closing of Agent Red Productions. Please read on:

Aug 13 2012

Contingency - a cooperative wave defense first-person shooter for the Source engine based in the Half-Life 2 universe.

Jan 17 2012

Contingency has been updated to v0.1.5!

Jan 7 2012

Contingency v0.1.0 Released news

Dec 31 2011

RT @ModDB: Contingency for Half-Life 2 has entered public beta just in time to reign in the new year. Try it out today!

Dec 31 2011

Happy New Year (almost)! Contingency v0.1.0 has been released! Download it now!

Dec 31 2011

Contingency is now sponsored by @Branzone, a professional hosting solutions provider! Our referral link:

Dec 19 2011

Contingency's first official public beta release date has been announced! We've got a brand-new trailer to show...

Dec 13 2011

Contingency is now on ModDB!

Nov 8 2011

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