Of the ones I've played, I've yet to play a more complicated table than Ripley's. I still don't fully understand how it all works, despite having played it an uncountable number of times. Simpsons Pinball Party seems overwhelming at first, but it makes sense after you've played it a few times and have an idea on how everything works. Big Bang Bar could be a contender for the top spot, as I've no idea what I'm doing on it, though I think this is due to a lack of good instructions available.