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.
User reviews:
Very Positive (87 reviews) - 96% of the 87 user reviews in the last 30 days are positive.
Overwhelmingly Positive (2,228 reviews) - 95% of the 2,228 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 (124)

July 26

Lambda Wars represented on Discord Hypesquad!
Hello Strategists!

Lambda Wars has taken thé next step on Discord. Namely, one of our Management personnel (Wrench) has applied to join the Hypesquad, and has been fully accepted!

What does this mean?

The Hypesquad receives various amounts of perks. Such as the ability to represent Discord Hypesquad during events, including goodies and shirts! This may seem like it isn't of use to us, but Discord is used by a LARGE amount of the populace, and it can help us gain many more members on our Discord server.

That's it for now, and I hope you're as ecstatic as we are!

LW Team.

2 comments Read more

July 25

Lambda Wars Discord!

Hello Strategists!
Now, as some of you may know, we have a Discord! But, it has come to my attention that there are still a fair few who knew nothing of it, so this is just a quick reminder to you all that yes, we do have Discord.

Now, you probably wonder what the advantages of the Lambda Wars Discord is. It's simple! If you have an itching to play some multiplayer, we have a channel specifically dedicated to finding matches. Found a bug or want to give feedback on a recently implemented? Easy, we have 2 channels dedicated for those exact reasons!

Want to help us Beta Test the game? Or, maybe you have a map idea, but you're not quite sure how to find your way around Hammer. We have 2 channels for that also!

So, hop on over! Give it a try!

2 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 :(
Customer reviews Learn More
Very Positive (87 reviews)
Overwhelmingly Positive (2,228 reviews)
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