Portal: Prelude, as its name implies, is an unofficial prequel to the game Portal. Its story revolves around the pre-GlaDOS epoch way before she was plugged in. Back then, test subjects were still monitored by real Aperture Science employees, a tedious, dull, and repetitive job. One of the reasons why they decided to build a great artificial intelligence that could both replace them for these complex tasks and also take responsibility for many other functions within the complex while competing with Black Mesa's superiority. All employees of the Aperture Science complex are now eagerly awaiting GlaDOS. A little too eagerly maybe, as the unfolding events will tell... This game is totally free. It offers a bit more gameplay hours than the original Portal, with 8 chapters, 19 test chambers, 48 challenges, 6 advanced maps, a brand new storyline and more than 400 lines of English dialogue with dozens of subtitles languages.

Description

This new version is shipped with more than 115 bug fixes, improvements and additions (since 1.0.0). We know everything's still not perfect, but we believe we put enough work in this mod and thus, this version should be considered final (except if something really bad happens). Please note because of steampipe there is a simple fix that you need to make to gameinfo.txt which is the same for every portal mod.

Preview
Portal: Prelude 1.1.5 (complete installer)
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Tron619
Tron619 - - 254 comments

ZOMG thanks
ZOMG I'M GONNA EAT A CARROT

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InStars
InStars - - 670 comments

i wish i had a carrot to eat...

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ChrisBryant
ChrisBryant - - 1,087 comments

I wish I had a black forrest cake to eat...

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Marvin.Damstra
Marvin.Damstra - - 273 comments

you can't have it, it's a lie

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K00PD4WG
K00PD4WG - - 110 comments

good thing the cheesecake isnt :D

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Guest
Guest - - 688,676 comments

Really

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Tezmatic
Tezmatic - - 86 comments

Wow i feel old seeing these comments

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Guest
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Ballads
Ballads - - 5 comments

(buried)

it doesnt work!

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NuBiTo
NuBiTo - - 621 comments

lol why is it burried? wat so bad about eating carrot. He's just being random. thats all

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NeRvE_Relapse
NeRvE_Relapse - - 3 comments

Because Of Too Many Negeative Votes lol

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Chocolate-Helicopter
Chocolate-Helicopter - - 227 comments

this comment is old

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Portal124
Portal124 - - 63 comments

yeah your comment is old.

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Guest
Guest - - 688,676 comments

HA, Your comment's old

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drunkenheadcrab
drunkenheadcrab - - 25 comments

Damn this comment is so old

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Guest
Guest - - 688,676 comments

too bad your comment is also old :/

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Guest
Guest - - 688,676 comments

Wow, this comment's so old!

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Guest
Guest - - 688,676 comments

Damn your comment is so old

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Guest
Guest - - 688,676 comments

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Guest
Guest - - 688,676 comments

now your comments old

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Guest
Guest - - 688,676 comments

no u

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Guest
Guest - - 688,676 comments

now your comment's old

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Guest
Guest - - 688,676 comments

holy crap it is old :)

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bryceyj10
bryceyj10 - - 5 comments

your comment is old also I like beans

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Guest
Guest - - 688,676 comments

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WHEMMm
WHEMMm - - 18 comments

CORRECT!

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CSGModFan2012
CSGModFan2012 - - 7 comments

all of you guys' comements are old!

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Guest
Guest - - 688,676 comments

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Guest
Guest - - 688,676 comments

Hello and again welcome to the Aperture Science Enrichment Center.

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Supermariogirl
Supermariogirl - - 15 comments

Coincidentally I was eating carrots while reading this. Small world.

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Guest
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UACmarine208
UACmarine208 - - 253 comments

i hope this was before the cake was a lie XP

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ZedoMann
ZedoMann - - 79 comments

There was no such time...

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CyberAltair
CyberAltair - - 2 comments

Damn, I really wanted to play this but with my internet connection this will take a lot of time =\

Isn't their as possibility of putting it in a .rar file in the future?

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matthijs186
matthijs186 - - 3 comments

They did, check it out!

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ContentRobby
ContentRobby - - 3 comments

how do you find the file to play it I downloaded it for like 1 hour now i cant find where to play it please help mod db.

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sudoku424
sudoku424 - - 52 comments

First, you must go to where you downloaded it to and then use that to install the game. Then, Steam must be restarted(or just started, if it wasn't running when you installed Portal Prelude), and then it will be in the games list of Steam.

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pie32
pie32 - - 69 comments

put the download under steam/steamapps/sourcemods then it will be in your steam game list as a third party mod :D

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matthijs186
matthijs186 - - 3 comments

that's right, a third party mod!!

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Portal124
Portal124 - - 63 comments

You run it...it is an installer lol.

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Lopper
Lopper - - 1,559 comments

it must of took a long time to upload a file THAT big XD

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Ballads
Ballads - - 5 comments

sorry false alarm :"

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Guest
Guest - - 688,676 comments

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randosity42
randosity42 - - 1 comments

installer at 1 percent...lol

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Killer_man_1996
Killer_man_1996 - - 511 comments

ME TOO... :(

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