Portal | Underground Story
created by Marty and Toby.

This Portal story is based on the MTN Portal Story | Part One!
This mappack includes around 75 levels.
in this mappack have Project One, Project twO and a Training room for Project twO
the Project One isent that good as Project twO beoucse the Project One was my second map i creat.
I learned alot of mapping when i make the One. so the twO is much better.


# Based on MTN Portal Story | Part One.
# Around 75 test chambers.
# Level design similar to the original Portal style.
# Level difficulty is balanced, like the original.
# New gameplay elements, e.g. super jumps and red laser.
# Easter eggs and secret chambers.
# Several paths and two possible endings.
# Awesome storyline.
# Epic moments/endings.

Don't forgett to read the "Read me!"

Have fun!


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Portal | Underground Story

Portal | Underground Story

Jan 5, 2009 Full Version 16 comments

Here you can download Portal | Underground Story To install, follow the Install steps.

Post comment Comments  (0 - 10 of 29)
Guest Feb 12 2015, 1:10pm says:

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loudonlune Oct 27 2011, 9:36am says:

This is great!

+2 votes     reply to comment
seanknee Aug 15 2010, 3:50pm says:

Great work on these maps, story one was great fun:) although I am stuck at mtn_chamber_01_2 where you see gladoss and the untextured room, and I cannot get through chamber 02_1 past the ledge above the deep fryer wall:) I use the super jump, but can't reach the othe ledge:(

+4 votes     reply to comment
飞翔鸟 Dec 13 2014, 12:27am replied:

It needs the portalgun. At the end of mtn_chamber_01_1 portal gun, not is call you into the elevator, you will not, on the console to play "ent_create_portal_weight_box" and then there will be a square in front of you, throw that square into the ion wall next to the hole, there will be a door open to you, by this is entering mtn_chamber_01_2, you will find that after entering the portal gun.

+1 vote     reply to comment
DarthRiko Aug 11 2010, 3:33pm says:

Found a glitch. In the room with the descending ceiling that crushes you, the obvious solution is to Portal over to the other side of the gap. What I did was put a portal under my feet, and when the ceiling was all the way down, I tried going back through the portal. I basically teleported to the top side of the crushing thing.

+2 votes     reply to comment
drgnzach Jul 28 2010, 4:23pm buried:


This map pack sucks big time. In order to even play it, I had to move a bunch of files around because the person who made it didnt have the load file directing to the right folder. Then, when I finally was able to play it, the AI disabled itself. Also, a better name for this map pack would be "Portal: Copy and Paste" Because half the map's concepts have been stolen from other mappacks.

-12 votes     reply to comment
Colossal Aug 1 2010, 5:37pm replied:

You have got to be the biggest idiot of all time. This map pack is older than a lot of the map packs you think it's stealing from. And I had no problems playing it, you're probably too much of an idiot to install it correctly.

+13 votes     reply to comment
Fernando5567 Jun 10 2010, 3:07am says:

the project two have 2 endings xD

+3 votes     reply to comment
projektariel Dec 10 2009, 1:40pm says:

Challenging mappack with interesting puzzles, especially the second part is recommendable for every Portal fan though its ending came a bit suddenly. :/ All in all: 8/10 :)

+2 votes     reply to comment
Colossal Mar 27 2009, 11:53am says:

This was mentioned on Podcast17 12401! But they don't know it's on this site. They also called the ending corny. :\

+2 votes     reply to comment
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Release Date
Released Aug 2008
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Puzzle Compilation
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