I just bought this cool app on my iPad that allows me to turn my songs into a game! I use my two-sided arrow to break through blue and yellow barriers that match the beat of the song it's playing! It has three difficulties and 2 modes. The regular mode always stays at the same speed, but in the warped mode speeds up the song the better I get at it. Not only the song speeds up but the pitch increases. When I hit some barriers that are the opposite color of my arrow, the song's speed and pitch decrease and eventually end up in tragic silence. It's like Yoshi's Story when a Yoshi has no petals on its Smile Meter. It's sort of scary to play in Warped Mode.