Bonus x advances by spelling S-H-A-R-P, S-H-O-O-T-E-R, or by shooting the saucer.
Advancing the bonus to 2x lights the spinner for 1k for the remainder of the game.
Rollover loop advances bonus by 1000 for each lit rollover (lit by S-H-A-R-P letters) and lights the scoop for 2x, 3x, 4x, or 5x value
The 50,000 lane is more difficult than other GP games but if you do shoot it from the right flipper it will almost always double collect