[Website] Before I continue, please note that this app will only be released for Android phones. Scheduled for a global English release this Spring, the Sword Art Online fone app will basically skin your interface with tons of related stuff, mini-games and even a full-fledge dungeon game.
Mini-game are free, for example the more you use your smartphone, the more guild members level. There will be wallpapers, ringtones, avatars and more. For the core game, where players climb the tower and fight bosses, there will be in-app purchases to unlock more levels after the free ones.