Center button is main goal is get 55 pieces of gold to light tortuga mb.
(Or bonus ball for Raguga (spelling?))
The best trick I’ve found is if you can loop the upper flipper shot a few times then hit the gold target. Instead of one pieces you can get 5 or 10 pieces.
There is also a character that collects all available gold on screen with one button.
The button is growing on me.