The terraformation of Xen known as "The Xeno Project" has begun. Noticeable changes to the planet thus far include regular gravity and a breathable atmosphere. After agreeing to work for the Gman, you are teleported onto a train, inbound to the Xeno Project control complex.

Your mission is to report to an underground test lab which has been set up for further experiments into portal technology. Everything seems to be going smoothly until the military decides to completely take over the operation. Once this happens, your goal will be to get the hell off the planet and escape back to earth.....good'll need it.

Author: Loki (AKA Mr. White)

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The Xeno Project 2

The Xeno Project 2

5 years ago Full Version 3 comments

The current version is Steamcompatible although Ill be releasing a more Steamfriendly installer soon. (from original author).

Xeno Project

Xeno Project

5 years ago Full Version 3 comments

It took longer than expected but Ive finally finished work on a Steamcompatible version of my 1st HalfLife SP mission The Xeno Project.

Post comment Comments  (0 - 10 of 16)
banan2288 May 4 2014 says:

It needs Sven Coop conversion

+1 vote     reply to comment
exudaz Aug 19 2012 says:

When I start the game, all I get is episode 2. How do I play episode 1? Please help.

+1 vote     reply to comment
asdfzxc Jul 15 2012 says:

I'm stuck in the seventh map of part 2 (the room with the laser and the escape pod). What are you supposed to do here?

+1 vote     reply to comment
Delta1000 Sep 17 2011 says:

Man, i really enjoyed playing this mod. I like the ending the best, wow. An incredible mod to play to the end people.

+2 votes     reply to comment
AI_COLONEL Apr 5 2011 says:

looks well cool

+2 votes     reply to comment
Gunship_Mark_II Feb 26 2011 says:

One of the best mods IMO.

+2 votes     reply to comment
Maxkhor95 Sep 17 2010 says:

I Saw a Microwave with Headcrab,When i press,The Headcrab being cooked,after become headcrab Meat.

I Designed a Cook The Headcrab Mod to Cook that Headcrab and Bullsquid Ambush and Cook the Bullsquid.

0 votes     reply to comment
Lazypro Jul 23 2010 says:

one of my other favorite series of mods to play

+2 votes     reply to comment
Satiam Jul 23 2010 says:

Not only the gameplay, but also the story was quite exceptional. I also liked the ending.
If you haven't played the Xeno Project yet, do yourself a favor and give it a try. You won't regret it.

+2 votes     reply to comment
Otner Apr 20 2010 says:

I thought Xen already had a breathable atmosphere. After all, Gordon Freeman, Barney Calhoun and Adrian Shephard were able to breathe on Xen without any sort of oxygen supply. Unless they held their breath the entire time... Great mod though.

+2 votes     reply to comment
sgtvishus Oct 5 2012 replied:


+1 vote     reply to comment
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Release date
Released 2002
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33 votes submitted.

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Highest Rated (2 agree) 10/10

Another classic mod for half life!

Jun 10 2012 by poshgaloo

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Link to Xeno Project I & II by selecting a button and using the embed code provided more...
Xeno Project I & II
Last Update
3 years ago
45 members