Base Defense is a cooperative and single-player modification for Half-Life, based on horde-style and RPG systems.
All Reviews:
Very Positive (87) - 87% of the 87 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 (4)

September 16

The time has come!

Hello! Yes, it is time to make an update. The main feature of this update is difficulty selection. Bug fixes and some tweaks are included (like no more Panthers on the 2-nd wave). The monster ladder was overhauled, now it is definitely more fair. Yet some monsters became more nimble. Zombie has returned into the ladder in its new incarnation, he is able to run now. Some little tweaks were made for less of player confusion with meeting pretty the same enemy, but different name or that "devoured soul" feature, which makes player think he should get the soul, but he doesn't. This soul drop mechanic was made to let player heal after killing a monster, but as it began to drop souls as a collectible it became overpowered, so the chances were cut greatly, which made the feature pointless. Getting +1-10HP with low chances has no real effect, so this way of healing was removed (every class has healing abilites anyway). You get guaranteed soul drop for making more than 10% of damage to Gargantua or last hitting Pantagruel. Random soul drop remains also, but it's too rare.

Main Changes
Sooo... The difficulty selection, it's pretty simple. There is a new advanced setting in create game menu called "Game Mode", before you play make sure you've selected the one which fits you more. Softcore mode is a default option.

The mechanics are pretty the same as when I was telling about this feature before. There are two modes: Softcore and Hardcore (read as easy and hard). Softcore is half of Hardcore numbers and the Hardcore is a classical game. All of the necessary information player will get right in the game. Here comes a new Introduction menu. It shows the prologue (or a map specific story), the information of any event running and the description of current difficulty setting.

One More Thing
The official Base Defense site which contains different information about the gameplay was raised from the dead once again. 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
  • Acid debuff now reduces your defense rate in a half
  • Poison debuff now disables your HP regeneration
  • Monsters with Lunatic buff are now a bit smaller than other ones
  • Now it's impossible to use Gargantua book until the game begins
  • Moved the most of monster attack effects to the client (less accuracy, but better server stabilty and smoothness in multiplayer)

  • Fixed crash on level change
  • Fixed no limit for Sentry supplies
  • Fixed unfair saving on deaths
  • Fixed no boss area on Winter Town
  • Fixed Vampire skill counting wrong healing
  • Fixed intermission camera setting issues
  • Fixed HL spinning player corpses
  • Fixed wrong bone alignment for player model
  • Fixed pve_neonlines instadeath when colliding with Gargantua
  • Fixed wrong muzzleflash position for Python
  • Fixed turrets aiming code for short monsters
  • Fixed wrong coding of Flamethrower particle effects
  • Fixed Satchels stacking (you can't use drop/buy scheme anymore)
  • Fixed items disappearance in some cases

  • Added a new game mode (easy difficulty setting)
  • Added a new death camera
  • Added corpses when player dies
  • Added Zombies to the monster ladder
  • Added clipping for thirdperson cameras
  • Added boss warning one wave before his appearance

  • Increased damage reduction for Rush skill (now it's 95%)
  • Increased damage reduction for Rush 4th Power (now it's 100%)
  • Increased Bullsquid tail whip attack speed
  • Increased chances of getting superior weapon in random box

  • Decreased hit points gain for Angels
  • Decreased hit points for Panther to 110 (was 125)
  • Decreased prices for superior weapons (greatly decreased)

  • Changed Gargantua hit points increasing formula
  • Changed 1-10 waves ladder (no more Panthers on 2nd wave)
  • Changed experience rewards for every monster (now it depends on their HP as money rewards do)
  • Changed footsteps playing conditions (removed mp_footsteps check for PvE)
  • Changed colors for save slots in "Load Character" menu (depending on availability)
  • Changed gravity reduction formula for Legerity
  • Changed aliens focusing priority for Angels (now it's the same as for player)
  • Changed Trooper aiming checks (less wall shooting)
  • Changed color of Slave attacking effect

  • Removed soul devouring mechanics (to avoid any confusion with taking and devouring a soul)
  • Removed Atomic Hounds from monster ladder (now they're just red Houndeyes)

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

See you in the game, comrades. Thanks for being a part of the Base Defense community.
6 comments Read more

July 23

Keeping the Defenders alive

I decided to make some news about what's going on with the mod. I have finally found some time to continue the work and it has really good results.

I get a lot of messages and reviews like "dis gaem is ded", but the truth is it will become dead only when I say. It was never a game with huge audience and it started as a little LAN-party project to play with my friend. Anyway the mod found its fans and they suggested me I should go for Steam. With the help of my little but great fan base I finally made it to Steam. So here we are, we have a mod with some of Steam features implemented which is something really unusual for HL mods. It's free and it gets updated. Its author is listening to the players and adds new features based on their suggestions. There are a few servers available which are not empty, but free. They are free for you and your friends. Isn't it nice?

Alright. As I said I listen to my players, so the next key feature will be difficulty selection. A bit of story: there was a time when I used standard HL difficulty settings, but then it was changed when I got a heavy criticism about "not challenging" gameplay. I completely forgot about newcomers and started to raise the difficulty until it became the current (1803) version, which is really difficult (pretty challenging too). Why it wasn't changed for a long time is because I didn't have any problems with difficulty and I was sure everyone could make some training to get better results. I was wrong, so I decided to return difficulty modes in their new incarnation. The players will be able to see the difference between difficulties not only in the game process, but in specific numbers too. When player joins the game it will show him the menu which will inform him of running events, server message and the difficulty setting of course. There are only two difficulty levels: Softcore (SC) and Hardcore (HC). HC is the same as current game is, but with little tweaks to make it more fair (wait for change log). SC could be described as a half of HC numbers, but has its own features. More specific information about these difficulties you will get in the game. Save file compatibility was saved and the old file will be recognized as it was saved in HC mode. Yeah, you can't load SC character in HC mode and vice versa. Updated "Load character" menu will show you the difficulty save file has and also will gray out the characters which were saved in another mode.

New version is in beta testing stage. If everything will be fine then I will make a release soon.

Tip: it's easier to find someone to play with in Base Defense official Discord server

See you in the game, friends. Thanks for being a part of the Base Defense community.
7 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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