Quoted from terrapinmark:
Thanks Stones!! Close. I really miss Meteor, Big Game, and Seawitch. Actually my favorite at the moment is Quicksilver! Someone mentioned all that you shoot for is the lit spinner. That couldn't be farther from the truth. The multiplier targets are extremely important. Spelling Quicksilver and getting 5X bonus results in a pretty cool light and sound show. Sweeping the targets in the center of the Playfield are also rewarding (spells a quicksilver letter)
Yes, spelling "Quicksilver" is much more lucrative than just shooting spinners, and more fun too. Maxing out the bonus gives you one of the best sounding and looking bonus meltdowns out there.