The switches on the wheel just knock out the respective lights. Your goal is to knock out all the lights either by passing through the rollover lane or hitting the switch on the wheel.

I find Sky Line to be a bit on the easy side because of the wheel.

The pop bumpers are just pop bumpers. They light for 10 points versus only one when not lit. I don't recall what causes them to light.

Sounds like it is a stepper ties directly to the advance targets. Find the stepper and with the game opened up watch its action as you hit the advance stepper.

That makes sense that they would set a feature up like that.