For those who are fans of rhythm-based gaming (such as guitar hero, DDR or Osu!) and also fans of the Final Fantasy games, this is the game for you. It features songs from all 13 final fantasy series and at first you will have access to 3 songs per title, however by gaining points and continually playing this number keeps going up.
The game starts off fairly easy giving you the chance to play the "Basic Scores" of all the hit final fantasy music (which is all really awesome) but then ramps up with each difficultly level. The "Ultimate Score" is difficult enough to satisfy those that play a lot of rhythm-based games and are thus fairly good at them. The Chaos Shrine gives the epitome of the range difficulty levels, having both easiest and most difficult of scores to play. The Chaos Shrine also uses street pass so you can pick up new "Dark Notes" to play from others!.
There are 3 main ways to play. Battle music (similar to Guitar hero and DDR), Event (more like Osu!) and Field (where you have to move the stylus to follow the notes). Combine this with the 3 game play modes (series, challenge and Chaos Shrine) and you will spend plenty of time perfecting each and trying to get the "S" rating in all the scores.
There are rewards for playing enough including collectible cards, songs for the music player and a theater (which features clips from each of the series). You can also level up characters, change abilities on your party, equip items and unlock secret characters. This makes theatrhythm a good transition game for those that may not be into the the rhythm-based games.
Those that are not all that familiar with the final fantasy titles may not find as much fun in this as someone who has played a great deal of them. However, the music is fantastic which made me greatly enjoy the titles that I had not yet played. People who are familiar will be delighted to see the return of their favorite characters and monsters =D