Set the game to factory, 3 ball, replay, tight tilt and factory outlanes. It can be very challenging! On this set up, my high score was 650 million-ish and I was only a few shots away from End of Line.
Certainly you can bash up the middle to restart Sparky over and over but there is so much more depth to the game besides the multiballs...Seek and Destroy, Fuel, 4 Horsemen, Lady Justice, 4 Crank it Up modes. If your routinely achieving and finishing all these, the game is either set up too easy or you're the next Keith Elwin.