This can be done on any difficulty, so pick a song and a difficulty and go nuts! Unlike guitar and bass, hitting two pads and the bass pedal or one pad and the bass pedal at the same time will count as three or two notes, respectively, not just as one (thanks Neutropia!). This shouldn't be too tough for anyone, as long as they aren't complete newbies to the idea of playing drums and have a working drum kit.