I bought a pro version a few weeks back. this is my first new pinball machine. I have 2 older Williams pinballs from 79.80. I have it set to 3 balls and have the new code. I really am into the game it looks great. these new pinball machines are a lot different than ones from the 80"s. I am not understanding the concept of stacking jackpots and, how to cash them in. the zap button cancels your award is that how they are stacked? Thank you.