I had a TSPP for a year and couldn't get to it. Only game I have owned in 15 years of collecting that I could not finish. For finishing the mode itself I had a lot of trouble with spidermans wizard mode. Could get to the wizard mode easy enough but never finish it. I would always drain before I could get the last shot behind the upper flipper. I finally got it a week before I sold it.
For williams games spider multiball was very elusive but it's not really a wizard mode. I had to change my playing style to finally get it. CV is another wizard mode I could get to often but not finish.
There are plenty of wizards modes that are nearly impossible to fail at. AFM and Indy (wms) come to mind.