Completing drops on top left increases bonus x; carries over ball to ball. After bonus is built up collect at right saucer.
A decent strategy is to shoot right saucer, catch on right flipper. Tap pass to left flipper, repeat. If you can do this you'll score well.
Rope-a-dope horseshoe spinner at top left is lucrative with a dialed spinner, but sometimes has a dangerous feed to the right outlane.