Base Defense is a cooperative and single-player modification for Half-Life, based on horde-style and RPG systems.
All Reviews:
Very Positive (108) - 86% of the 108 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 (5)

October 31, 2018

Happy Halloween!

Hello! New update is out. It features in-game event and a beta of new Halloween-special mode. The mode is called Dark Night, it makes any map very dark. If you ever wondered how original maps will look with dark lighting then you are able to find this out. There is a new advanced setting in create game menu called "Dark night mode (beta)" and it has a checkbox, check it if you want to play with dark lighting.

I am happy to present a new in-game event: Spookdays. All bosses in the game now will drop one candy on death. Candies are droped for a specific player, so the other players can't pick it up, unless it's more than 3 minutes have passed since the candy was dropped. To get a candy drop for yourself you need to deal more than 25% damage to the boss. The goal of the event is to collect 31 candy to get a new cosmetic item, you can check your progress in a task menu (default key is "V"). Characters who have a charm already (like Christmas Joy from Festive Winter) are not able to take part in this event.

Every player in the game will have a pumpkin instead of usual helmet. It has a glow effect when the character is in dark places of the map. This effect color is fully customizable in Multiplayer Settings. You could notice 2 sliders there which stand for Helmet and Cosmetic colors. Set your Helmet color to anything you like.

Good luck and have fun!

Another Thing
Here is the official Base Defense site which contains different information about the gameplay. It's ad-free, clean and simple.
Base Defense Information Pages

If you are new to this game, then I suggest you to take a look at the Guide, which is available at the official site or community hub.
Base Defense Guide

Change Log
  • Fixed thirdperson crash (kinda another changelevel crash)

  • Double rewards bonus in Softcore mode is now disabled after 20th wave
  • Gauss knockback was reduced
  • Gargantua money rewards were reduced by 60%

  • Spookdays event has been added

Tip: If you are looking for someone to play with, check here:
Base Defense Official Discord Server

See you in the game, friends. Thanks for being a part of the Base Defense community.
6 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

What Curators Say

3 Curators have reviewed this product. Click here to see them.

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