Based on the Portal: The Flash Version (Portal.wecreatestuff.com)
This Mappack brings all of the 40 levels plus some more originals.
The story takes place before the events of Portal and shows you the enrichment center from another perspective.
This Mappack includes ALL 40 levels from the Flash version, additional bonus levels and features. All together, we've got here over three and a half hours of amazing gameplay.

Features:

- Based on Portal:TFV
- More than 40 test chambers.
- Level design similar to the original Portal style
- Level difficulty is balanced, like the original
- New gameplay elements, such as the Electric Floors, Crushers, Blue and Red frizzles from the Flash version
- Isn't a test chamber after a test chamber, much more than that.
- Awesome storyline that connects to the Portal and the Half life 2 story
- Epic moments.
- Boss battle.
- Epic ending.
- The longest custom map so far, at least as far as I'm aware.

*More info in the readme.txt

More info and Screenshots here: Portalmaps.wecreatestuff.com

Have fun.