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.

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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.

Post comment Comments  (0 - 10 of 36)
thedeadcamper
thedeadcamper

I wish I played this closer to release. It was a solid experience and I liked it.

So... it is possible to get the gnome from the very beginning all the way to the end, though there are some kind of buggy parts that make that experience hard, and the ending doesn't seem to acknowledge anything is different. Are there ANY Easter egg for doing that or am I just being extremely obsessive at this point?

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asw01
asw01

why is the Scenes folder empty? my console just says "Scene 'scenes/rhett_hideout_madeit.vcd' missing!" whenever it comes to a location where a Scene is supposed to play, i checked the mod folder, and the only thing in there, is a scenes.image, whats going on?

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DarkShift
DarkShift

Well the last map is also beautiful but the last fight is really a disappointment.

9/10

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DarkShift
DarkShift

This is incredibly good, I'm at the beginning of the fourth chapter (lighthouse), but so far it's as good as HL2 Deep Down, you did a very good job at creating beautiful map's, you seem to really know what you're doing from the beginning to the end, the fights and sequences are varied, hard, there is numerous challenges, I'm really pleased by this, this can be a masterpiece.

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linkfania
linkfania

I can't play the first two chapters.
HEEEEEEEEEEEEEELP

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EddAdrian
EddAdrian

i enjoyed the mod so far but i think i am the ending on the last chapter and there is a bug when i fight the combine on that cliff a wave or two comes then nothing happens and i see a ship and hear combine down below in the water, they look stuck.

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Dune_Jumper
Dune_Jumper

Good mod.

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Guest
Guest

Nothing short of brilliant!!!

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Guest
Guest

you did good work! me and gnom ride to the sun set best ending :D

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Beez-one
Beez-one

I haven't finished it yet. Overall impression is great (opening was awesome and big zombie fight of second map is one of the best zombie fights I've seen, utilizing every zombie and headcrab possible) but it goes down gradually.
I think airboat sequence should be revised. Too many stops. Too many combine. Too few supplies. It just big tedious fighting sequence in its current form. Also there is a bug with one of hunters at "turn the container" point. He could stuck in a building wall you just exit. Speaking of hunters in general I feel like their population may be halved. And there is one which I think is in area too small and crowded with combine for interesting fight, the one after sniper section at toxic wastes. That spot is too tight.
About sniper at toxic wastes - I think that third turret should be moved or removed. It feels very cheap.
Antlion fight at transmitter is ridiculous. Any casual player would probably quit at this point. Why is it using antlion Guardian instead of Guard? There was no foreshadowing for this and with a ton of regular antlions around it felt like I won boss battle in Dark Souls.
Looking forward to strider battle, this one is going to be hard...

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Half-Life 2: Episode Two
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