When the Combine raid your Resistance hideout, you are forced to flee into the depths of the Outlands. But with Overwatch forces hunting you down, and the local fauna out to get you, danger is always just around the corner. Play through four chapters of Half-Life gameplay, exploring new locations, meeting new characters and uncovering lost secrets.

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Half-Life 2: Uncertainty Principle is out now! It's available exclusively to download over at RunThinkShootLive.com (although it will be uploaded here too after a timed period).

When the Combine raid your Resistance hideout, you are forced to flee into the depths of the Outlands.

But with Overwatch forces hunting you down, and the local fauna out to get you, danger is always just around the corner.

Play through four chapters of Half-Life gameplay, exploring new locations, meeting new characters and uncovering lost secrets.

2015 09 26 00011

2015 09 26 00024

2015 09 26 00040

Hope you enjoy playing!

Release Uncertainty

Release Uncertainty

News 6 comments

The mod Uncertainty Principle is not cancelled or abandoned, it is safe on my hard-drive and mostly complete. Unfortunately I'm just not going to have...

Long overdue update

Long overdue update

News 2 comments

An update on the development of Uncertainty Principle.

All about Uncertainty Principle

All about Uncertainty Principle

News 2 comments

Here's some more information about this mod for you.

RSS Files
Uncertainty Principle 1.0

Uncertainty Principle 1.0

Full Version 2 comments

The full release version of Half-Life 2: Uncertainty Principle in .zip format.

Comments  (0 - 10 of 49)
gdogamer2
gdogamer2

i can't see it in the library

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CaptPatrick01
CaptPatrick01

And here I am, waiting patiently to see if it would work on MMod.

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CaptPatrick01
CaptPatrick01

Update: It has an MMod patch now. Works great!

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Zippys2
Zippys2

Full gameplay

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gdogamer2
gdogamer2

i can't see the mod in the steam library can you help me?

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Zippys2
Zippys2

Make sure you had install correctly and restart steam and set sdk 2013 to upcoming.

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Guest
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saivert
saivert

Is it possible to port this to Source SDK 2013? You have access to all game assets anyways.

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darksniper45
darksniper45

I have problems with the third map, it is about the lighting is the typical problem of hdr and fullbright of half life 2, but try fix it but i get the same error, some help.

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Guest
Guest

When I load the mod in Steam, it shows a pink and black checkerboard; plus, when I click new game, it only shows the first chapter, and does nothing when I try to play. I tried adding Ep2's materials and models folders to the mod, but that didn't help. Any help would be greatly appreciated! Thanks!

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Half-Life 2: Episode Two
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