Mr Freeman has once again been “recruited” by the elusive and stone-faced G-man to handle a “situation’ that could prove catastrophic if not handled immediately.
It seems that a rift in the space-time continuum has allowed the minions of Xen to establish a stronghold inside one of the main reactor cores in the Lambda Complex. Somehow they have figured out a way to tap directly into the complex’s nuclear power grid. They are using this energy to continually widen the rift to allow more and more of the Xen inhabitants into our world. That’s bad.
Oh, did I mention that the military has been instructed to keep a lid on this situation by eliminating ANYONE with knowledge of it? That’s worse.
Its Gordon’s job to establish power to the test lab, and then find his way to the reactor complex via the waste tunnels connecting the two. Once inside, he’s got to find his way to the interior cores of the reactors and shut them down.
You’ll need to keep your wits about you…
You’ll need to trust your instincts…
You’ll have to rely on your GUT REACTION!
Good luck Gordon.
- Title: Gut Reaction
- File Name: hl1-sp-gut-reaction.7z
- Size : 3.56Mb
- Author: Tim Johnston AKA Slingblade
- Date Released: 16 November 1999






















19 September 2005 at 2:28 pm
This was the first ever user created map I played, back in 2001(Got it off a PC Gamer UK disc). It was great then and it’s still great now.
27 August 2006 at 4:12 am
4/5 to be a Half Life map pack.
27 August 2006 at 9:45 am
Please use the ratings feature.
14 April 2007 at 9:43 am
Can someone tell me why this mod doesn’t show up in my Steam game list. If not Steam compatable how can I play?
27 June 2007 at 4:44 am
Played this today.While it is difficult its also fairly long.This was made awhile ago so I cant say much on textures etc but they really were not to bad for that era.Just a tad dark was my biggest problem.
13 June 2008 at 6:55 pm
Good mod. The only problems I had with it were some parts were REALLY CONFUSING. Other than that , It’s a great mod. 5/5 (sorry i rated 1 out of 5 ‘cuz i thought this was a diff. mod. I *MEANT* 5/5)
16 June 2008 at 11:52 pm
Great mod. This old stuff is really refreshing to go back to. Good mix of fighting humans and aliens and solving ‘the way through’. Properly developing adventure story with a real climactic ending. Best is the colouring and lighting – a visual treat.
27 August 2008 at 3:56 pm
Added 18 screenshots kindly supplied by piledriver.
22 February 2009 at 2:48 pm
Nice levels, good balanced and long playtime. Hard to find the way through.
08 May 2009 at 1:41 pm
Hey guys…I recently googled this mod just to see if it was still out there and what do you know! Glad you’ve enjoyed it. I cant believe its been 10 years since I built this thing, and also that Half Life is that old!Thanks for all the kind words. It took me many hours to build this thing. I havent really touched it since I released it. I know its not perfect but its gotten a lot of good reviews so it must be doing something right.
Enjoy!Tim
04 January 2010 at 3:44 am
This mod is one of the better mods that I’ve run across. It’s a little short but has some interesting gameplay. A pleasant way to while away an afternoon.