Lambda Wars (formerly Half-Life 2: Wars) brings the struggle between the human resistance and their Combine overlords to a multiplayer real-time strategy setting. The Lambda Wars beta only requires Alien Swarm installed to play. It features 3 multiplayer game modes: Sandbox, Annihilation and Overrun, showcasing the Rebels and Combine playable factions and a full-fledged RTS interface and HUD. There is also a singleplayer tutorial and a handful of singleplayer missions.

Report article RSS Feed Half-Life 2: Wars Beta 2.0.0 Released!

Major new release - HL2 Wars is now on the Alien Swarm engine! Featuring new maps, new HUD, full tech trees, new game modes and more.

Posted by Ennui on Sep 25th, 2012

We are proud to announce the release of Beta 2.0.0 of Half-Life 2: Wars! It is our first public beta release in nearly two years and introduces a slew of new features and improvements to the mod. HL2 Wars now runs entirely on the Alien Swarm version of the Source engine, meaning it only requires Alien Swarm installed to play (although you MUST legally own Episode 2 in order to play this mod). Beta 2.0 also features a completely redesigned HUD, new building models, new maps, and more variety of units, buildings and abilities than ever before!

Beta 2 is the first major release of the mod that has all of the core multiplayer gameplay fully implemented, so if you haven’t played in a while now is a great time to check it out again. Download Half-Life 2: Wars from Desura now and read on to learn more about what Beta 2 has to offer.


The screenshots above are of hlw_slums, a new map created for Beta 2 by Arietta, the latest addition to our team. Slums is a 1v1 map set in a sprawling urban environment with lots of ruins and cover and paths which makes for a lot of interesting tactical options. It is designed for the primary game mode of HL2 Wars, called Annihilation. He also created the other new map in Beta 2, called hlw_synth, which has a very Alien Swarm feel, taking place in a snowy Arctic installation. Up to four players can duke it out in a free-for-all or team game on Synth. You can see a screenshot of the map below. In addition to the new maps, some older maps have been updated to include support for more game modes.

You can also see from some of our previously released screenshots that we have a brand new HUD and interface. This isn’t news to anybody who has been following our progress over the years, but now it’s ready for public consumption! We have finally gotten rid of our placeholder building models and have full sets of Resistance and Combine structures along with full unit, upgrade, and ability tech trees to go with it. Many units that were not previously playable in multiplayer Half-Life 2: Wars are now fully implemented including Striders, Hunters, and Vortigaunts as well as all the old favorites.

The mod now runs entirely on the Alien Swarm version of the Source engine, meaning you only need Alien Swarm installed to play. However, the game uses HL2: Episode Two content so you must legally own that in order to play HL2 Wars.


Half-Life 2 Wars is only available for download through Desura, a free digital distribution client made for mods and indie games. This is for our convenience as developers - we can easily disseminate updates through Desura rather than having to manually create and distribute patches and client files. You must have Desura installed ONLY to download and patch the mod, but not to play - it will show up in your Steam library as usual. You do NOT need to have Desura running in order to play.

You must have Alien Swarm installed to play. Visit our website or the help page in-game for more information. Also please remember this is still a beta release and we expect players to encounter a lot of bugs that we have not found yet, especially since our playtesting time has been sorely limited in recent months. Please report bugs, gameplay feedback and balancing suggestions to our community forums to let us know what you think and so that we can fix them in future releases!

We expect to release the first patch (Beta 2.0.1) within a few weeks to address any bugs or balancing issues that are discovered in that time.

Post comment Comments  (50 - 76 of 76)
WaffleAndy Sep 26 2012 says:

I came.

But I'd also have to agree with the previous comments, why can't it be added on Steam or even here instead of Desura?

+2 votes     reply to comment
WaffleAndy Sep 26 2012 replied:

Oh and I forgot to mention, I crash whenever I tried to launch the mod from Desura :/

+1 vote     reply to comment
WaffleAndy Sep 26 2012 replied:

Nevermind, it automatically fixed itself. I've played it for a bit, and tried out the survival mode (I think that's what it's named) then selected infected, but all I saw were errors rushing towards my group :/

+1 vote     reply to comment
Pandango Sep 26 2012 replied:

I think a moddb download link is awaiting verification, not sure though.
The infected are being shown as errors because the l4d package isn't mounted. This will be fixed in the next patch.

+1 vote     reply to comment
Discrate Creator
Discrate Sep 27 2012 replied:

Try launching from steam?

+1 vote   reply to comment
Discrate Creator
Discrate Sep 27 2012 replied:

Desura is only used as a platform to automatically update the mod. The mod is still on steam and launched from steam.

We have released a zip file for those people who really really really don't want to install Desura, but having Desura will be easier to update the mod in the future

+2 votes   reply to comment
dudeallen Sep 26 2012 says:

Seems to have quite a few bugs...

+5 votes     reply to comment
WaffleAndy Sep 26 2012 says:

Hey, I'm having a problem with the game. No matter which I choose (Play offline, create a game in public, etc.), my attempts of adding a CPU to my game fails everytime. If I ever DO succeed to add CPUs to my game/lobby, then they don't do anything in-game at ALL. Can you guys please fix this?

+1 vote     reply to comment
[FH]Gorgutz Sep 30 2012 replied:

If you've noticed on the main menu after launch, if you take the time to read it, CPU's aren't available as of Beta 2.

+1 vote     reply to comment
MisterMister Sep 26 2012 says:


+1 vote     reply to comment
HEVcrab Creator
HEVcrab Sep 27 2012 says:

When I play Overrun for rebels and complete Tier 3 research, my engineers still cannot build any mounted turrets etc., though I have sufficient resources.
Has anybody experienced the same issue?

BTW (to prevent possible future bug): when research level is upgraded, the new abilities should be unlocked for the engineers that were spawned before the upgrade as well.

+1 vote   reply to comment
Sander Creator
Sander Sep 27 2012 replied:

Yes, it's a bug. Will be fixed in 2.0.1. Overrun uses a different tech tree and the mounted turret is not linked to the correct tier upgrade.

+1 vote   reply to comment
HEVcrab Creator
HEVcrab Sep 27 2012 replied:

Thanks for the rapid reply :)
One more thing I remembered: the keyboard shortcuts (spawning different units for Headquarters, commands for units etc.) don't work.

+1 vote   reply to comment
joneau Sep 27 2012 says:

oh **** now this needs alien swarm which i dont have ****

+1 vote     reply to comment
SIR_halyavshik Sep 27 2012 replied:

its free2play , you can easily dowload it

+5 votes     reply to comment
HEVcrab Creator
HEVcrab Sep 27 2012 says:

Sander (or smb. of the developers who knows it), please tell why sometimes when playing Overrun against Combine on or_hill (the only Overrun map where one can play for rebels, I guess?), striders don't show up at all. What does the appearance of striders depend on? It's wave 15, the enemy infantry is almost all elite.

+1 vote   reply to comment
SnakeTheFox Sep 30 2012 says:

You know, not being a fan of RTS games I've yet to really get into this, but looking at screenshots and the like, it occurs to me that a XCom/UFO-style turn-based tactical game on the Source engine might be really interesting (and do-able, perhaps even more so than a straight RTS).

+1 vote     reply to comment
ALPHA-1 Sep 30 2012 says:

everyone that wants to team up and play overrun please add my steam JackCipher, i went into the servers and NOBODY was online.

0 votes     reply to comment
$n!p3r Oct 2 2012 says:

omg i love you now !

+1 vote     reply to comment
skati99 Oct 2 2012 says:

If I download from Desura I'm I suppose to have the beta 2 ?

+1 vote     reply to comment
TeH_n00b_GaMeR Oct 4 2012 says:

right, nice one. ill play it if/when it appears to greenlight or here.

+1 vote     reply to comment
Discrate Creator
Discrate Oct 4 2012 replied:

It is on here.

+1 vote   reply to comment
greedyNARC Oct 5 2012 says:

How do I install? I downloaded the zip that is hl2wars but where is the exe?

+1 vote     reply to comment
Discrate Creator
Discrate Oct 7 2012 replied:

There isn't an exe. Just simply extract the zip to your steamapps folder in your steam folder.

+1 vote   reply to comment
Maury Oct 6 2012 says:

Try this mod.

+1 vote     reply to comment
lorenzitto Oct 6 2012 says:

No chances to make it integrated on Steam? Wasn't the old beta working like that?

+1 vote     reply to comment
DuffCreeper Oct 13 2012 says:

So your saying that when I got HL2:Wars the models were F*cked even when I owned HL2 with episodes 1 and 2 then validate files. But it's because I didn't install alien swarm? someone PM me

+1 vote     reply to comment
Gregthegen Oct 14 2012 says:

Wow... so many comments about desura... I guess ppl were already ****** about Origin replacing Steam for several games that they wont even touch another distribution with s nine foot stick... (not an issue for me but still)

To mod devs, please dont take their comments personally against your mod. use whatever distribution works best for you, however know that a signifigant portion of your user base would prefer it on steam if you would have the time.

Usually only mainstream games get this much flack for going to one distribution or another, speaks to the mods quality IMO>

+1 vote     reply to comment
Morthon Oct 18 2012 says:

Meh, liked it better when it was still based purely on the original source engine.

+1 vote     reply to comment
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