Portal: Prelude

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This mod for Source has been released! Download it now.


Portal-16px.png A singleplayer mod for Portal created by a team of three crazy frenchies with way too much time on their hands.

Title Portal: Prelude
  • Nicolas "NykO18" Grevet
  • Jérémy "Capitaine Mousse" Barbe
  • Marc "Moroes" Bidoul
Genre Puzzle game
Mode Singleplayer only
Platform PC only
  • Processor: Intel Pentium 4 3000 MHz
  • Display Card: DirectX 9 compatible graphics card
  • Memory: 1024 MB
  • Free Disk Space: 1.5 GB
  • Operating System: Microsoft Windows 2000/XP/Vista

Dev team

Nicolas "NykO18" Grevet

Jérémy "Capitaine Mousse" Barbe

Marc "Moroes" Bidoul




Portal: Prelude, the 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 and set to be released somewhere around the end of September 2008. 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 speech with various languages (subtitles).

Remember kids, it's not just a mappack, it's a whole new story, and I hope that you'll appreciate the work done for you.


  • 8 chapters
  • 19 test chambers
  • 48 challenges
  • 6 advanced maps
  • A brand new storyline
  • More than 400 lines of speech
  • An enhanced difficulty (you bet)
  • English, French, Dutch, Finnish, Hungarian, Italian, Korean, Portuguese, Russian and Spanish subtitles


To find the latest updates on Portal: Prelude, you can view our website.


See: http://www.portalprelude.com/screenshots.php



See: http://www.portalprelude.com/soundtrack.php


See: http://www.portalprelude.com/wallpapers.php