Portal 2 - The Final Hours is an interactive digital e-book. It includes articles, photos, videos, interviews, interactive experiences, and "other surprises" regarding Portal 2's development and launch.
And on the wiki page you can see: "Adobe Air needs to be installed"
so yeah it is an AIR app
the official page is here: http://www.thefinalhoursofportal2.com/
here the description
The Final Hour of Portal 2 takes you deep within the top-secret offices of Valve, creators of Half-Life, for an unvarnished look at the creative process behind the new video game Portal 2. Journalist Geoff Keighley was granted unprecedented "fly on the wall" access to Valve over the past three years to create this staggering 15,000 word multimedia experience. From the hush-hush Portal prequel that was shelved to the last minute scramble to complete the game's story, The Final Hours of Portal 2 is a gripping and dramatic story brought to life by exclusive photos, videos, interviews, interactive experiences, and other surprises. Watch the teaser trailer.
It is available on the app store, steam and amazon store,
here few screenshots
Sorry if all that look like advertising, it is not, and it is not placed content, far from it.
but look at "the author" informations and you will see
The Final Hours App was designed by Joe Zeff Design
and when you visit JZD you see this message
A boutique agency that blends software with
storytelling, helping the world's largest
companies tell stories more effectively.
And to do that, they use Adobe AIR, see this blog post: JZD FAQ
We design and develop most of our apps using Adobe Digital Publishing Suite, which lets us work faster and more flexibly than other developers. The platform is built around Adobe InDesign, an intuitive page layout application, allowing us to spend more time thinking about content than coding.
Our clients often decide to purchase their own Adobe DPS license in order to update or manage their own apps once we have launched them. Adobe offers three flavors: Single Edition, Professional Edition and Enterprise Edition. Single Edition is a way to publish standalone apps. The other editions add storefronts for magazine-style apps with separate issues. Enterprise Edition allows you to customize your storefront and distribute private apps outside of the App Store.
And Digital Publishing Suite use Adobe AIR to publish mobile app.
It seems it is not supported anymore even if you have a forum,
from this post https://forums.adobe.com/thread/2143362
Apr 20, 2016 6:57 AM
Oh, and Single Edition apps were removed from Creative Cloud and Adobe.com a year and a half ago.
And it seems the solution have been replaced by Adobe Experience Manager
which now publish mobile apps based on Cordova/PhoneGap.
Still... my point mentioning all that is that
- Adobe build a tool reusing Adobe AIR to publish AIR app out of InDesign
- a company focused on building "story telling" apps
and apparently was quite successful with this concept
- and even if the tech have been removed/replaced/etc.
"Portal 2 - The Final Hours" is a good example of this kind of "story telling" apps
And yeah DPS does not exists anymore, but everything it did can be programmed in an Adobe AIR app, it's not very complex.
Just saying, if you're not sure what kind of app or game to build, going into the story telling type of apps can be an easy way to experiment, it's like the CD-ROM from the 90's, pick a subject you are interested into, write text, illustrate with pictures, animations, little game-type experiments, etc. and package all that with AIR.
You can publish pretty decent apps like that.