Theatrhythm Final Fantasy is a music game much like Oendan/Elite Beat Agents where you tap the 3DS' pen on the touch screen in time with the beat.
There are three different types of stages (four if you count the unfailable opening and ending bonus songs): 1) Event, where the song path can move anywhere on the screen as a full motion video plays in the background; 2) Battle, where all four of your characters line up and attack if you hit their inputs at the correct time; and 3) Field, where your character travels from left to right with your inputs.
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To see all three in action, check out the video above (and sorry about the auto zoom/color correction; they are nonadjustable on my poor little camera).