Lambda Wars is a free standalone multiplayer Source Engine modification set in the Half-Life 2 universe that brings the war between mankind and their brutal Combine overlords to a traditional real-time strategy (RTS) setting.
Recent Reviews:
Very Positive (85) - 91% of the 85 user reviews in the last 30 days are positive.
All Reviews:
Overwhelmingly Positive (2,430) - 95% of the 2,430 user reviews for this game are positive.
Release Date:
Dec 5, 2014

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Community-Made Mod

This is a free community-made modification for Alien Swarm set in the Half-Life 2 universe.

Click here to learn more about mods on Steam.

Install Lambda Wars Beta

Free Alien Swarm Mod


Recent updates View all (143)

October 20

This Week in LW News! (Week 3)

Hey there, you Commanding Strategists!

Welcome to Week 3 of LW News! This week, I've some juicy info for you, so strap on in.

BarraBarraTiger, one of our lovely Developers, has something in the works for you. I won't spoil too much of it, but I'll show you some of screenshots I've been allowed.

Along with Barra's efforts, we have Darkness working his typical shifts, playing games occasionally, and working on some of the internal coding. Prettying up and balancing, which is what we need most right now.

Also! DrMad, our beloved MD with a temper, has started streaming on Twitch! Around 3 - 7 GMT. Find him here, at "". Catch him on Saturday/Sunday streaming.

Welp, that about concludes this weeks News report. Come back Next Friday, for some more juicy updates!

Here's one teaser image ;)

Here's another one, you dirty dogs ;)
8 comments Read more

October 13

This Week in LW News!

Hello Strategists!

Now, this week we've been up on our stuff, with Darkness spilling the beans about how are game is quite literally perfect and if you say ANYTHING other than that we'll have you publicly tar and feathered, and 99% bug free! Also, we have 2 patches pushed out for you, mostly pertaining to balancing and such.

Asides from this, there's nothing else to report. Go play some LW and try out these new patches!
13 comments Read more

About This Game

Lambda Wars is a free multiplayer Source Engine modification for Alien Swarm set in the Half-Life 2 universe that brings the war between mankind and their brutal Combine overlords to a traditional real-time strategy (RTS) setting. Lead the uprising as a commander of the Resistance or crush the rebellion as an overlord of the Combine, with both factions featuring a full host of units, abilities, buildings, research and defenses. Lambda Wars features full-fledged RTS gameplay and a robust RTS interface and is focused on multiplayer but strategic AI opponents and dedicated singleplayer missions are also included.


  • Classic real-time strategy (RTS) gameplay in the Half-Life 2 world
  • Multiplayer support and game lobby including spectator mode
  • Wide variety of maps for up to 8 human or AI players
  • Play as either Combine or Resistance (and also Antlions in Sandbox mode)
  • Full unit tech tree that allows you to command everything from Manhacks to Striders
  • Full-fledged RTS interface and HUD with everything from minimap and fog of war to unit and production building groups
  • Build production and research facilities to requisition better units and unlock abilities and upgrades
  • Defensive structures, turrets and mines help defend your headquarters and vital resource points
  • Multiple game modes
  • Singleplayer missions, tutorial map and offline AI skirmish mode

System Requirements

    • OS: Windows 7
    • Processor: Dual core from Intel or AMD at 2.8 GHz / Quad-Core Intel at 1.33 GHz
    • Memory: 1 GB RAM
    • Graphics: Intel HD Graphics, nVidia Geforce 8600GT, AMD Radeon HD2600 or better
    • DirectX: Version 9.0c
    • Storage: 4 GB available space
    • Sound Card: DirectX 9.0c compatible sound card
    • Additional Notes: These are the minimum requirements to be able to run on lowest settings
    • Memory: 3 GB RAM
    • Additional Notes: Being able to go easy on us devs for all the bugs and glitches :(
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