Multiball is pretty simple: shoot the Mix Master as much as possible. The display shows a counter, which is the number of Mix Master target hits you need to collect the jackpot. During Multiball, all 9 targets work the same; a hit to any target decreases the counter by 1.
The jackpot is worth from 1M to 5M. The value seems to be random from one jackpot to the next. Completing the Drop Targets doubles the value of the current jackpot.
The target counter starts at 15 for the first jackpot, and goes up by 10 for each subsequent jackpot on the same Multiball. The counter is reset to 15 at the start of each Multiball round.
During Multiball, the Elements of Coolness are available, but they just score points — you can’t collect Elements for later Multiballs.
Once one ball drains, regular play resumes. There is no restart shot. All scores are doubled as long as you keep the remaining ball in play.