Portal: Prelude, as its name states it, is an unofficial prequel to the game Portal. Its story revolves around the pre-GlaDOS epoch, even before she was plugged in. At this time, test subjects were monitored by real Aperture Science employees, whose work was tedious, lengthy and repetitive. This is why they decided to build a great artificial intelligence that could both replace them in these difficult tasks, and also take responsibility for many other tasks within the complex and compete with Black Mesa's superiority. All employees of the Aperture Science complex are now eagerly awaiting GlaDOS. Maybe even a little too eagerly, as the upcoming 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 speech with dozens of subtitles translations.

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First mod, which I've downloaded and one of my favourites. Great atmoshpere and nice puzzles, a lot of new challenges. 10/10


Chillius says

May contain spoilers 1 agrees 1 disagrees

this mod has 19 hard f*** Maps To Do 00 Go Through A Portal 01 Get The Orange Gun 02 Learn To Use Gun 03 Upgrade Gun 04 Using Infinite Fall 05 Learn How To Use Edges And Time 06 Learning About Dangers
07 blue/yellow Deadly Walls 08 using Yellow Walls And Turrets And The Portal Shoot Through Port And Momentum 09 Learn Side/Foward Fling
10 Using Gravity 11 Energy Ball 12 Copy of 4 And Still Alive 2 13 Complex thinking Time 14 Can't Remember 15 Using Switches And A Swear Word Sh*t 16 Think So Complexity 17 Like 16 But Longer 18 Get Cube Through Random Crap 19 Do A Like 1 Hour Map Ending Unlock Glados

Kinda Bad But I Like It Anyway I Have This Running (8 Now Due To The Wall Glitch Fixed :( )

This sets the standard for all portal mods.

A bit lame voice acting, but a lot of hard puzzles, makes the original Portal look like childs play. A good story as well

Portal Prelude is a great mod, But be warned, it is really hard.

epic work

Really good mod!

This mod is BETTER I repeat BETTER!!! then the actuall portal game itself :D


This mod do not deserve 8.6. It should be 9 at least. Also I can't understand persons who gives lower than 7. You can't give a low score for a game for its hard. If you don't know how to play, dont play any portal mod. Thats all.

Also makers of this mod first language aren't english, so you cant blame them for they are terrible at voice acting. This mod includes orginal ideas, orginal gameplay, orginal chambers, orginal story. Also difficult is not very hard for a person that he knows how to play portal. OK maybe hard, but not very hard. You should be patient. I like this mod's musics. They are relaxing me.

About this mod, you should have to play.

This is genious, I really enjoyed it!

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