Ontamarama preview at 1-up.

"Although at first Ontamarama seems a bit like a simplified Dance Dance Revolution, it requires unique, two-fisted gameplay. Or more specifically, gameplay with one hand on the D-pad and the other clutching a stylus. As a series of directional indicators scroll across the top of the screen (with each input icon timed to correspond to the beat of the current backing track), the player's task is simply to tap the appropriate direction on the D-pad as the corresponding icon reaches the end of the scrollbar."

Full Source: 1-up