It starts out simple and gets brutal quickly. It has a clear appeal for fans of retro games not only in the visuals and sounds, but in its striking but rewarding difficulty. Players can hear clear differences in the music's make-up if even one item is missed, encouraging them to get every pickup to hear the full tune. Somehow, it's oddly reminiscent of playing a musical instrument--much more so than, say, Guitar Hero. The better you get at the game and the more familiar you become with the levels, the more you'll want to go back and try to beat your high scores.