Possibly before this game had 0 as the lowest possible score, it allowed negatives, so he hit the lines after he hit all three for a total of -1 + 3 = 2...?
@SimonM: The hints for this level are angle, angle and angle. As for all the rest of the levels. Of course I could tell you to shoot the first shot at an angle of 195 degrees, but that is the stuff you have to figure out yourself. Some levels are so hard that people have spent days, weeks and even months to figure it out, so I guess you have to do the same!