John Bedford (Modojo): Don't worry about grabbing a chair, this one won't take long. Chillingo's new mobile game The Impossible Line is simplicity itself, you see. You're presented with a series of chalkboards, and on each one there's a starting point, a finishing point, and a whole lot of walling between the two. Your job? When the game starts, the walls vanish from the screen, and you have to steer the chalk line from start to finish without colliding into a single invisible wall.