Lambda Wars is now a free standalone mod on Steam: Steam Store (December 2014)

Lambda Wars (formerly called 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.

As of December 2014, we have released the game on Steam as a free, standalone mod. This means you DO NOT require Half-Life 2, Alien Swarm or any other Source game to download and play Lambda Wars on Steam.

For questions, comments, suggestions, and support for any of our past or upcoming betas, visit our forums or steam community hub.

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Lambda Wars Update

3 months ago News 16 comments

Last Wednesday we released our biggest update yet! This update includes three new units and two new buildings, many balance changes and improvements.

First off we replaced the Rebel Partisan with an updated version. This unit has two main attacks between which you can switch: throwing molotovs or stinkbombs. Molotovs do light damage at units around the target area, while stinkbombs slow units down. Second we got the new Riot Metro Police, equipped with a shield and stunstick. In offensive mode, this is a fast moving melee unit. Using the station ability you can deploy the unit, generating a cover spot for units behind the metro police.

riot preview

Furthermore we added the Rollermine to the Combine, which you can produce at the also new Mechanical Factory building. The Rebels got a new Offensive building, the Teleporter. Using this building you can teleport units to anywhere on the map, as long as you have vision. A teleportation takes 40 seconds to complete. During this time the units being teleported are unusable and rift is created at the target location, visible to enemies.


The full changelog is:

Gameplay & Balance
* Added Combine Metro Police Riot:
	- Replaces Combine early unit Metro Police with Pistol
	- Equiped with Stunstick and Shield
* Added Rebels Partisan wtih Molotov:
	- Replaces Rebels Partisan unit
	- Autocasting ability Molotov, setting the target units on fire
	- Ability stink-bomb, temporary slowing down the movement of hit units
* Added Combine rollermine: shocks enemy units with a small chance to stun
* Headcrab Canister launcher:
	- Now has three launch abilities for regular, fast and poison headcrabs
	- Reduced Canister health from 550 to 300
	- Increased range from 5000 to 9000.
	- Increased crawl out speed of Headcrabs
	- Spawned Headcrabs roam the map to find enemies
* Added Combine Mechanical Factory building:
	- Builds Scanners, Manhacks, and Rollermines
* Added Rebel Teleporter building
* Infested zombies now roam the map to find enemies
* Headcrabs can now damage buildings.
* BugBait:
	- Increased throw range from 800 to 1000.
	- Increased recharge time from 1 to 30.
	- Increased energy 30 to 50.
	- Uses smaller, faster antlion version.
* Dispel:
	- Increased recharge time from 2 to 3.
	- Increased energy from 30 to 50.
	- Increased range from 800 to 900.
* VortAttack:
	- Decreased energy from 10 to 5.
	- Decreased recharge time from 1.8 to 1.5
	- Decreased damage from 60 to 30.
	- Increased range from 575 to 590.
* Vortigaunt:
	- Increased in combat energy regeneration rate from 1 to 2.
	- Increased speed from 242 to 245.
	- Decreased build time from 48 to 42.
	- Decreased health from 300 to 250.
	- Decreased max energy from 370 to 200.
	- Changed cost from 45req, 50scrap to 50req, 36scrap
* Vortigaunt Den:
	- Decreased scrap cost from 40 to 30.
	- Decreased build time from 54 to 50.
* Manhack:
	- Removed light attribute.
	- Reduced health from 40 to 30.
* Veteran:
	- Requires Steady Position to attack.
	- Added Smoke Grenade ability.
	- Increased range from 870 to 1100.
	- Increased build time from 32 to 35.
	- Decreased health from 210 to 170.
	- Decreased view distance from 1200 to 1000.
	- Increased requisition cost from 45 to 50.
* Saboteur - Removed Smoke Grenade.
* Combine Sniper - Increased health from 110 to 160.
* Hunter - Reduced power cost from 50 to 30.
* Synth Factory - Reduced power cost from 50 to 40.
* Claw Scanner:
	- Mine automatically recharges after being deployed.
	- Mine is uncloaked, health increased from 40 to 100.
	- Mines no longer bounce and roll after being dropped.
	- Mines hop towards enemy.
	- Disabled bullet 2 bonus damage vs creature.
	- Disabled pulse 0.6 damage scale vs creature.
	- Disabled shock 50 bonus damage vs heavy.
	- Disabled shock 0.5 damage scale vs synth.
* Rebel & Combine Barricade - Added 1 extra cover point.
* Improved reliability of Dog Jump ability
* Hunter jump ability: Behaves more predictable and now acts on all Hunters in player selection
* Combine Manhacks can now be build at the Headquarters, with Armory building as requirement
* Replaced Combine Observer by not cloaked, faster and cheaper Scanner unit
* RPG attribute now has reduced damage against medium (-50%) and heavy (-30%) types of units
* Reduce flash ability recharge time from 60 to 25

* Vortigaunt starts at full energy when spawned
* Energy of all units is replenished between waves now

* hlw_synth, hlw_antarctica and hlw_aurora: update scrap points to use small versions
* hlw_thirst: mountains are now impassable and removed (confusing) day/night cycle
* Added: or_village (Overrun mode)
* sp_valley - Combine attack your flag on hard difficulty
* hlw_mine: tweak scrap marker position to fix an issue where engineers could get stuck

UI & Lobby:
* New loading backgrounds;
	- Metrocop loading background by Revvylo
* Show game mode for found online games
* Improved speed of creating or joining a lobby
* Fail to join lobbies on different game version (through friend invites), which would result in not joinable games
* Small performance improvements html UI

Unit Navigation:
* Simplified navigation meshes, preventing several issues and resulting in better performance
* Some unreachable cover spots are now filtered from being displayed

* Ability being cancelled before the player can target something due units dying in the selection
* Unable to place mountable turrets properly on some map spots (hlw_slums)
* Fix units not following a target unit properly after the target unit hold a position or was in cover
* Melee units (e.g. Zombies) not getting close enough to hit buildings 
* Fog of War toggle in Sandbox showing incorrect behavior
* Strider minigun shooting at feet of infantary rather than body
* Rebel rpg attribute not being applied to enemy units, resulting in missing bonus damage against synth type of units (Strider and Hunter)
* Potential exit crash due cleaning up CEF panels
* Fix (online) game lobby empty and unusable upon creation in some cases
* Fix black terrain, only in Simple lighting mode (e.g. Geforce 7 cards)
* Fix checkmark font character not displayed in game lobby on Windows 10

* Add Hungarian translations, provided by Bence Gercuj
* Russian translation updated by Chiffer

teleporter preview

To get Lambda Wars for free, visit our Steam store page:

Lambda Wars Beta HL2 RTS Mod Released For Free on Steam

Lambda Wars Beta HL2 RTS Mod Released For Free on Steam

11 months ago News 8 comments

Our first official Steam release since passing through Greenlight in January!

Lambda Wars Beta 2.3.6 Released

Lambda Wars Beta 2.3.6 Released

1 year ago News 2 comments

Beta 2.3.6 is a collection of bugfixes and small visual and balancing updates to the mod to help prepare for our release on Steam later this year.

Lambda Wars 2.3.5 beta is out. Heading for Steam release, recruiting!

Lambda Wars 2.3.5 beta is out. Heading for Steam release, recruiting!

1 year ago News 5 comments

Beta 2.3.5 is the first TOTALLY FREE release of the mod, not requiring players to own Half-Life 2: Episode 2. Check out its numerous bugfixes, gameplay...

Lambda Wars Beta 2.3.4 Released

Lambda Wars Beta 2.3.4 Released

1 year ago News 1 comment

Beta 2.3.4 is a minor bugfixing and balancing release, with both patch and full releases.

RSS feed Downloads
Lambda Wars 2.3.6 FULL EXE

Lambda Wars 2.3.6 FULL EXE

1 year ago Full Version 15 comments

The newest version you can now get directly on steam, completely free, no other games needed. Install Instructions: 1. Run the Installer and follow the...

Lambda Wars 2.3.6 FULL 7z

Lambda Wars 2.3.6 FULL 7z

1 year ago Full Version 2 comments

Install Instructions: 1. Extract contents into your sourcemods folder (default location: C:\Program Files (x86)\steam\steamapps\sourcemods). 2. Restart...

Lambda Wars 2.3.5 7z PATCH

Lambda Wars 2.3.5 7z PATCH

1 year ago Patch 4 comments

Install Instructions: 1. Extract contents into your sourcemods folder (default location: C:\Program Files (x86)\steam\steamapps\sourcemods) and overwrite...

Lambda Wars 2.3.5 FULL EXE

Lambda Wars 2.3.5 FULL EXE

1 year ago Full Version 6 comments

Install Instructions: 1. Run the Installer and follow the instructions. 2. Restart steam. 3. "Lambda Wars" should now appear in your games list. If you...

Lambda Wars 2.3.5 FULL 7z

Lambda Wars 2.3.5 FULL 7z

1 year ago Full Version 0 comments

Install Instructions: 1. Extract contents into your sourcemods folder (default location: C:\Program Files (x86)\steam\steamapps\sourcemods). 2. Restart...

Lambda Wars 2.3.4 FULL 7z

Lambda Wars 2.3.4 FULL 7z

1 year ago Full Version 1 comment

Install Instructions: 1. Extract contents into your sourcemods folder (default location: C:\Program Files (x86)\steam\steamapps\sourcemods). 2. Restart...

Post comment Comments  (0 - 10 of 1,975)
Angel_of_Death2 Oct 10 2015 says:

Guys,i have a question, what combine unit is good against a strider?

+1 vote     reply to comment
Guest Jun 8 2015 says:

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elek2008 Aug 15 2015 replied:

Like the heroes from rise and fall civilizations at war.

+2 votes     reply to comment
darkyuri Apr 6 2015 says:

I have got problem with terrain,
terrain is black.

+1 vote     reply to comment
modmakin Mar 29 2015 says:

A Company of Heroes veteran should easily understand this mod/game
WITHOUT the tutorial.

+1 vote     reply to comment
skullzans Feb 28 2015 says:

Personally i wish the antlions made a return... I loved the race... But i understand the lack of NPCs... So perhaps i make suggestions:Change the race from Antlions to Xenian Remnants and include other wildlife of xen

+1 vote     reply to comment
Guest Sep 24 2015 replied:

This comment is currently awaiting admin approval, join now to view.

skullzans Sep 17 2015 replied:

So, noones done anything about this? I sad.

+1 vote     reply to comment
Soviet_Conscript Jan 25 2015 says:

Hi, guys, do you plan adding units from Raising the Bar and Leaked Beta version of Half-Life 2?

+1 vote     reply to comment
HEVcrab Jan 25 2015 replied:

I've suggested adding Cremator and Assassin as Combine counterparts of Flamer and Saboteur, also figured out some abilities for assassin to work well in RTS. Hopefully they will be included one day, I expect them to make nice additions to the gameplay.

+3 votes     reply to comment
Soviet_Conscript Jan 28 2015 replied:

Ооо, так мы можем и по-русски?)

+1 vote     reply to comment
Soviet_Conscript Jan 27 2015 replied:

It's will be cool if we see in game more synths, like synth mortar or synth crab. And more alien units in combine army. In your plans rebels have a some kind of tank?

+2 votes     reply to comment
young_warrior Feb 14 2015 replied:

rebels should have vehichles, made from spare and salvaged parts (like the buggy, airboat and the muscle car)... for example, a scout car, like a small buggy with a light machinegun ontop of it, a sturdy car, like a jeep with some armor plates and a heavy machinegun on it, a "apc", like that modified van from l4d and it firepower should vary depending on the size of the platoon that it is carrying (rebels using their guns on small portholes to cover the apc) and a "tank" that can be recovered old tanks or trucks carring recovered mortars on their back!
as for the combine... well, combine mechanic and synth units that were seen before, plus some news like combine tanks a light and a heavy type, scout cars etc. etc.
btw the game looks pretty impressive, i doesn't look like it is on its beta stage, it looks like a complete game!
really fun to play!

+1 vote     reply to comment
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Alien Swarm
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Release date
Released 2012
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1175 votes submitted.

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Highest Rated (14 agree) 10/10

Very original, very fun, and i see a LOT of great potential for this mod in the long run.

Nov 27 2010 by Heroman117


Latest tweets from @lambdawars

Aug 17 2015

@PrivateCreeper No, they provide armor for other units and they can use their stunstick for melee damage.

Aug 17 2015

New structures aside, the Combine now have a reworked unit! Meet the Riot Metrocop!

Aug 16 2015

Here's a sneak peek of the new Combine Mech Factory and the Rollermine.

Aug 13 2015

Take a look at the Rebel Teleporter which is one of the buildings to be released in the upcoming big update:

May 15 2015

A small update has been released which includes map updates and some bug fixes

May 11 2015

We released an update containing achievements, Combine resource changes, one new map, balance changes and bug fixes.

Mar 10 2015

Take a look at Dog's new jumping ability!

Mar 10 2015

We released another update 3 days ago. This update includes multiple gameplay and balance changes! Full changelog:

Feb 6 2015

We have released another patch which includes bugfixes, visual enhancements and map updates!

Jan 6 2015

A new update released containing a new map, balance updates, bugfixes and more! You can see the patchnotes here:

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Lambda Wars
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