Draw Pac-Man - the sharp angle of the mouth, then his round body - and he'll animate and move off in the direction you drew him facing. Guide him towards the roaming ghosts by drawing walls in front of him: the direction you draw the wall is the direction in which he travels.That's the simple premise behind this game, and it captivated the crowds when the DS was first playable at last year's E3. But there's more to Pac-Pix than that. It's much cleverer than we originally thought. Although ...