Okay, I'm stumped.

I'm in Ep. IV, Chap. 6 (Rebel Attack). I have 9 of the 10 packets. I can't seem to get the one which requires you to fly over the 8 green squares and light them up. I've tried everything and every ship that I have (I've bought them all, yet there's one missing...I think it's the one you get when you have all the packets in all the Chapters).

Is there a trick to this? Which ship do I use? Do I just resign myself to being a failure on this exercise?

Please help me!