It's taken me about 50 games, but I've finally ironed out some success on gem. Someone mentioned hitting it during Quorra multiball and that's an excellent idea. It's an easier shot from the upper flipper when the ball approaches it not hugging the left wall. Sometimes a slow ball or say more than one ball will come down it (like during Quorra) and that's when you can consistently make the shot. Also, I often have luck using the right flipper to bank off the TRON targets. Be careful though,because hitting the end of the upper flipper or that post next to it will send the ball back at you in a hurry. My problem is completing light cycle multiball. I'm just not good enough to take them all out with a short two ball multiball.