I don't know what the different rule on Grand Slam would be, but frankly, Grand Slam, IF IT'S SET UP RIGHT AND LEVELED.... (/sigh)...is such an easy game, I really don't know why you'd ever want the add a ball. On mine, I can get 30-40 runs pretty easily. I haven't waxed it yet, so there is that, but I don't see it making a significant difference. It's already clearcoated.

Though, I will say that Card Trix is way better than Spin A Card (or whatever the replay is named..). You NEED extra balls in that game to roll the machine.

Pretty sure Card Trix will let you get as many as you can as well...

Anyone know if there's a rules difference between Royal Guard and Palace Guard, or if it's just straight across replay=extra ball?