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A new "full-scale" free-to-play (with in-app purchases) Final Fantasy game is out now for iOS and Android devices. It's called Final Fantasy Brave Exvius and includes a "captivating story" with turn-based gameplay.
This version includes the following:
• New items and daily quests
• High-definition graphic support for tablet devices
• Achievements and Leaderboards
• Game balance refinements based on the Japanese version
• Facebook Login Integration
• Two types of bundles for purchase:
o “Early Bird Bundle” (a one-time purchase at $3.99) will be available at for beginners who wish to grow their characters at a faster pace
o Other bundles available regularly for purchase for players to obtain characters and items quicker

Adventurers begin their quest for a highly-coveted crystal, shortly meeting two knights from Grandshelt, and a young girl. With special appearances by classic FINAL FANTASY characters like Cecil, Vivi and Terra, players adventure through fields and dungeons discovering items, collecting gil, uncovering hidden paths, and unlocking high-quality CG-animated summons.

The game has been out in Japan for a bit and boasts more than 6.5 million players. At least, that's what they tell me.