Over the past few years Square Enix has be re-releasing the old Final Fantasy games (I - IV and maybe more) for mobile (iOS & android) and as far as I remember

Over the past few years Square Enix has be re-releasing the old Final Fantasy games (I - IV and maybe more) for mobile (iOS & android) and as far as I remember all of them require always active internet connections to play. I tried to play on a plane recently and could not unless i paid for the wifi. For a single player game that originally had no network connectivity. Or you can download an android emulator and rom and play without needing internet. Now this is not ideal because the input is not the best. The native apps have built for mobile controls, but require internet.