I discovered an interesting bug the other day that allows you to stack modes with multiball. If you collect the first sniper tower hurry up and start multiball while the second hurry up is still running, it will not stop the mode like usual. Instead, the mode will continue to run during multiball. Moreover, the next mode start light will relight during multiball, allowing you to start another mode! Normally, modes are completely shut off during multiball. You can get as many as two modes going at the same time. Unfortunately, things don't behave exactly like you'd expect. For example, I tried stacking blackout with multiball to hit double jackpots, but for some reason you cannot light the jackpot during this stack. Stacking bad impersonator with multiball is a mess, because both modes want the center drop target in different states, so the center drop target goes up and down repeatedly. I was also able to stack blackout with ultimate challenge (very hard to pull off), but the ultimate challenge jackpots aren't doubled.
Has anyone else found this bug? Is there a way to exploit it for big points?