Theatrhythm Final Fantasy is a rhythm game most easily likened to Elite Beat Agents or Ouendan. You tap and swipe the screen when the markers appear, and the music is from Final Fantasy games. With me so far? It gets complicated, which by now you have to expect from a Final Fantasy spinoff.
There are three kinds of songs: Field, Event and Battle. Each has a different way of the markers appearing, and each requires different stats on your characters to get the most points. You pick a team of 4 from the leads of each main FF, and can unlock more later using shards. They each have stats which effect the types of songs in a different way, to hopefully get better items (such as the aforementioned shards). There are more nuances than this but I'm not even sure I fully understand them myself.
There's also three modes: Series, where you play three songs from each main FF plus an intro and outro; Challenge, where you play to get the best scores; and Dark Notes, which are randomly generated depending on your team level and is where all the systems come together with great effect. There's a hell of a lot to be getting your teeth into here.
The game is well designed and the graphics are great, and of course the music is good too. If you like rhythm games you might like this, if you like Final Fantasy you might like it, but if you like Final Fantasy and rhythm games you should go out right now and purchase this.
Now, what do I have to do to get Capcom to make this for Breath of Fire?