Xenoblade Borderlands (I can't decide between 1 or 2) The World Ends With You Demon's Souls Does Persona 4 count, since it was released during this generation? If so, that one. If not, Valkyria Chronicles.
Sony bought Konami and will release a DDR game for the Nintendo DS. In this game, you set your DS on the floor and stomp on it till it no longer functions.