Pulse is a MOD for Half-Life 1. Pulse takes place in Black Mesa after the incident. You are famous scientist Gordon Freeman. In the beginning of Pulse, you are in Surface Lab A Security Complex, a lab and security station on the absolute surface of the Black Mesa Research Facility. You are working with your scientist pals when one scientist working with a hazardous radiation meter detects high radiation amounts coming from all over. They radio into the Administrator's office, the office of Dr. Wallace Breen. Instead of Breen answering, they pick up a remote conversation between Breen and an unknown voice. "It's done," Breen said. "The xenian crystal triggered a dementional rift between Earth and the boarderworld Xen. Now let's get to the surface!" "I'm sure my employers will be pleased," says the unknown voice, and then silence fills the room followed by an explosion. The other scientists are amazed that the Administrator of Black Mesa himself would work with someone to trigger such a disaster and are trying to turn Breen in to the Special Projects Executive, the overseers of the Black Mesa Research Facility. The only way to get the S.P.E. to believe them is to get Dr. Breen's special operations profile from his office and hand it over to the S.P.E. as evidence. The scientists, however, are terrified of entering Black Mesa after a resonance cascade saying it is too dangerous. Gordon Freeman volunteers to go into Black Mesa, retrieve Breen's Administrative profile and bring him to justice.

This MOD suggests that Gina Cross was the one to push the xenian crystal into the anti-mass spectrometer and Gordon was not near Sector C at the time. Surface Lab A Security Complex is located on the surface of Sector D.

The scientists detect that Breen's Administrative profile is located in the Lambda Complex so your goal as Gordon Freeman is to get the Lambda Complex and retrieve Breen's profile and make it back to Surface Lab A alive.

Pulse: Episode One Beta 1 is now released! Click here to download it!

If you need support with installing this Mod, if you need help beating some of the levels, or if you want to report a bug with this Mod, please visit our forums and post a message there! We appreciate you downloading Pulse, and we hope you enjoy it (even though it's just a beta release).

For more downloads and background information, visit the Pulse Mod website at www.cortello.com/pulse.

Image RSS Feed Latest Screens
Lambda Level C Hallways Lambda Level C Elevator Exit Corrosive Core
Blog RSS Feed Post news Report abuse Latest News: A Long-Awaited Update

1 comment by Tom25 on Aug 8th, 2010

It has been quite a while since I have posted an update for this mod - almost a year. I've been playing some Half-Life mods recently and I've noticed how much I would love to get back into finishing Pule: Episode One and fixing the buglist that I made over a year ago. I really do wish to continue development of this mod. I had the entire storyline planned out chapter-by-chapter with a lot of great ideas in store. Sadly, I don't know if this will be the case, at least not for a while.

Frankly, I have the desire to finish this mod, but I just don't have the time. Being a one-man team makes it tougher because I don't have anyone to ask to do some things with the mod while I'm busy with other things, so everything is on me. Once the academic year begins again, I'll have little-to-no time to resume work on this mod. I have various other priorities on my list as well, and finishing Pulse just isn't near the top of the list (as much as I would like it to be). I think it would be awesome to finish it, and I really want to get back into modding. However, it just isn't feasible for me at this time.

I figured that those of you watching and hoping for an update of this mod deserved at least this short message. I apologize for the huge delay, but I have to be honest when I tell you that there likely won't be any new releases for this mod for the next several months (at the minimum). For now, the Beta 1 release is available for anyone who wishes to play what is done of Pulse so far, and I welcome you to give it a play and I hope you enjoy what I have done so far. Also, please excuse the poor architecture in the beginning of the mod - it gets better as the mod progresses.

In conclusion, I thank you for sticking with Pulse and I regret to bring this message to you. However, there is still hope for the future of this mod, and if I find time in the distant future, I would like to finish more of it, fix the bugs, and get it ready for you all to enjoy. Thank you.

Media RSS Feed Latest Video
Downloads RSS Feed Upload file Latest Downloads
Custom .WAD Error Fix for Beta 1

Custom .WAD Error Fix for Beta 1

Jul 28, 2009 Patch 3 comments

Fixes the custom .wad error that occurs half way through Pulse: Episode One Beta 1. Small file to download, and easy to install (follow the readme.txt...

Pulse: Episode One Beta 1

Pulse: Episode One Beta 1

Jul 26, 2009 Full Version 9 comments

That's right - Pulse: Episode One Beta 1 has been released! Now, this is not a final release, but it is a beta version of Pulse: Episode One. This is...

Pulse: Puzzel Demo .zip

Pulse: Puzzel Demo .zip

Nov 7, 2007 Full Version 7 comments

This is a demo for Pulse to show what puzzles in this MOD will be like. Please download this!

Fix for Lambdabox

Fix for Lambdabox

Sep 9, 2007 Multiplayer Map 1 comment

This is lambdabox map, just with a few minor fixes.

Pulse Demo #2

Pulse Demo #2

Sep 8, 2007 Full Version 1 comment

The second official Demo for the Half-Life 1 MOD Pulse.

Map LambdaBox for Pulse

Map LambdaBox for Pulse

Sep 4, 2007 Multiplayer Map 0 comments

A multiplayer map created by Pulse's makers. PLEASE READ DOWNLOAD INSTRUCTIONS IN README FILE!

Post comment Comments  (0 - 10 of 82)
minecraftircmod Jul 5 2013, 6:15am says:

it doesn't have any maps

+1 vote     reply to comment
Guest Aug 14 2013, 10:14pm replied:

Sure it does. Look in the maps folder.

+1 vote     reply to comment
simtexa Oct 1 2012, 1:02pm says:

But, Gordon worked at sector c! and he was in the test chamber!!!

+1 vote     reply to comment
Guest Aug 14 2013, 10:16pm replied:

This comment is currently awaiting admin approval, join now to view.

Guest Dec 6 2012, 7:16pm replied:

This comment is currently awaiting admin approval, join now to view.

REGISTERGODDAMNIT Oct 1 2012, 4:18am says:

is this dead?

+1 vote     reply to comment
fearsds Aug 16 2012, 1:14am says:

i haven't play this game yet.

-4 votes     reply to comment
BrownyTheOne Sep 9 2012, 3:23pm replied:


+3 votes     reply to comment
nickfrosty47 Aug 15 2012, 8:43am says:

From what i saw in the video there is not much storyline it looks more like strate up killing but thats my opinion and please do not take offence of it.

+1 vote     reply to comment
nietzschesaurus Aug 11 2010, 2:34pm says:

i can't get past the part with the 10,000 black ops. it makes no sense why they would all be standing there and i'd barely have anything to defend myself with.

+5 votes     reply to comment
nietzschesaurus Aug 11 2010, 3:22pm replied:

i finally said **** it and put on god mode. eventually came to realize that the game was little more than hallways that connected groups of 50 enemies at a time. the mapping was okay, the story made no sense, and half the time i was swimming through lag because the console was spamming something akin to TOO MANY ENTITIES IN VIEW or something, due to the ungodly number of mobs spammed everywhere. when i ran into the wad error i quit playing. extremely sub par. you could've done a lot better from the looks of it.

+4 votes     reply to comment
Tom25 Creator
Tom25 Aug 11 2010, 3:02pm replied:

Yeah, I'm sorry about that. I went way overboard with enemies in some parts of this mod. In the next release, I'll definitely tone some of those areas down.

+2 votes   reply to comment
nietzschesaurus Aug 11 2010, 3:24pm replied:

cool. i did enjoy it despite requiring godmode most of the time. you're a good mapper. i look forward to seeing your next attempt.

+2 votes     reply to comment
Post a Comment
click to sign in

You are not logged in, your comment will be anonymous unless you join the community today (totally free - or sign in with your social account on the right) which we encourage all contributors to do.

2000 characters limit; HTML formatting and smileys are not supported - text only

Half-Life Icon
Developed By
Send Message
Official Page
Release Date
Released Jul 2009
Mod Watch
Track this mod
Community Rating



32 votes submitted.

You Say


Ratings closed.

Lowest Rated (2 agree) 1/10

Best. Mod. Ever.

Aug 6 2011, 12:01am by Paincake|KRSK

First Person Shooter
Single Player
Embed Buttons

Promote Pulse on your homepage or blog by selecting a button and using the embed code provided (more).

Pulse Pulse
Last Update
2 years ago
99 members