When guitar games like Guitar Hero first came around, they seemed ridiculous. Who would spend all that money to get a cheapy plastic guitar and play a simplistic rhythm game? You'd have to be nuts, right? Well, the outcome wasn't quite what we were expecting, and now there are even DJ games on the horizon that include full decks instead of guitars and drums.
Hip Hop All Star is a bit like one of these games, except that you're using your phone's keypad instead of an expensive peripheral. It's still a rhythm game though, and you have to press buttons in time with symbols as they spin around a rotating vinyl record.