My brother gave me this Pelican "screen magnifier" for my GBA for Christmas, which I promptly lost under the bed and rediscovered this week. Sitting down and using thing the thing with Konami Arcade Advance I managed to clear the loop in Time Pilot and nearly clear the loop in Scramble, both of which were definite improvements over my usual ability. I think that the (roughly) 50% increase in apparent screen size really helps out. Doom looked better, too. I highly recommend it to anybody trying to dodge bullets on a GBA screen.