Go to the topic for more details:
http://www.gtaforums.com/index.php?showtopic=512761

Download:

Level 1: Download
Level 2: Download
Level 3: Download
Level 4: Download
Level 5: Download
Level 6: Download
Level 7: Download
Level 8: Download

Chapter II: In progress

Level 9: Download
Level 10: Download
Level 11: Download

Walkthrough here:

http://www.youtube.com/watch?v=BgAeqT2A2WQ&list=PL992A01DD17C94B9E&feature=plcp

READ THIS FIRST!

To play these missions, you must download this pack, it's the most important thing:
http://www.mediafire.com/?3uc96jdifsr8skq
And I just want to say that this is not a copy of Portal 2, I just take the idea and change the story.
Feedback are appreciated.

Rules:

-You can only create a portal on a white wall.
-You can't create a portal on any other wall (different color, gates, fences, ... )
-You can't create a portal on the ceiling. (the roof)
-Please follow the rules!
-And the most important thing is... DO NOT CHEAT!
-If you get stuck somewhere, just ask.