Editor's Notes & Price Research
Although, the Final Fantasy Portal app mentions this is the portal version, it is identical to the full priced version. The Portal App is required to play Final Fantasy. This offer ends August 31, 2015. -slickdewmaster
I never played any Final Fantasy games but hear they're awesome. I just went through the steps and launched FF1 which seemed to work without problems. Enjoy!
Update: Thanks to "bballisbest" it also works for android too! And thanks to "Zodiacs" for the link:
To manually backup the downloaded FF1 app data within the FF portal app on iOS:
Using a tool such as iMazing or iFunbox, access the app data folder of FF portal, backup the Library, Documents, and StoreKit folders. When you reinstall the FF portal app, just copy back these files to the app data folder.