Base Defense is a cooperative and single-player modification for Half-Life, based on horde-style and RPG systems.
All Reviews:
Very Positive (75) - 85% of the 75 user reviews for this game are positive.
Release Date:
Nov 20, 2017

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Community-Made Mod

This community-made mod requires that you own Half-Life .

Click here to learn more about mods on Steam.

Install Base Defense

Free Mod

Recent updates View all (2)

March 3

Achievements and more!

It's time to make an update!

What's new?
As you could notice some time ago there is achievement information appeared on Base Defense page in your Steam Game Library. Still you couldn't get any achievement progress and this is because of the system testing. This update brings you an ability to start earning the achievements!

Pretty good, huh?
There is also appears a new map, which takes you to the Winter Town.

Change log
  • Added new flags for spawn spots "No flying monsters", "Except boss wave"
  • Added a new map "Winter Town" (pve_wintertown)
  • Added achievements system (based on Steam Achievements)

  • Turned on SDL2 mouse/joystick input handling (this should be a fix for mouse issues)

  • Increased framerate for VGUI

  • Fixed wrong mana cost for Offense aura when Bosses are nearby
  • Fixed Gargantua stomp damaging other aliens

  • Removed in-game event "Festive Winter"

P.S. Please note that servers are hosted by other people, so it will need some time for them to update.

Thanks for playing!
9 comments Read more

About This Game

Base Defense is a co-op modification for Half-Life based on horde-style and RPG systems. You're able to choose one of three classes, then join the fight against most dangerous monsters which are hunting you. Every class has its own abilities and traits. You can become a killing machine or a strong support for your teammates. In game you can get different items with magic powers: helmets, armor and trinkets. As you kill monsters you will get experience points and level ups. Difficulty of the game grows exponentially as you progress, don't forget to upgrade your stats. There are checkpoints every 10 waves, so you won't lose your character and loot.

Make your own epic character build and experience the most challenging battles!


The war between good and evil was interrupted by an alien invasion. The Demons ran back to hell and the Angels fled to heaven. Only the humans were left, surrounded by aliens. Three heroes called the Defenders send the humans back in time into another realm causing past and present to merge.

In-game events are happening after the merging of times.

System Requirements

    • OS: Windows XP, 7, 8, 10
    • Processor: 1.0 GHz CPU
    • Memory: 256 MB RAM
    • Graphics: 32 MB
    • Storage: 400 MB available space
    • Sound Card: Any
    • OS: Windows XP, 7, 8, 10
    • Processor: 3.0 GHz CPU
    • Memory: 1 GB RAM
    • Graphics: 128 MB
    • Storage: 400 MB available space
    • Sound Card: Any
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