galactic pinball question

On http://www.videogamereviews.vg/virtual_boy_reviews/galactic_pinball_dan_mil.shtml it reads
“There are four tables, plus a bonus table that can be activated by hitting a certain number of stars on any stage. The variety is great, and can keep you playing for hours, except for the automatic pause every twenty minutes that you get in any virtual boy game”

I have played the game many times, but never ever seen a secret level or any stars in any level exept the bonus stage where you need to hit all stars to get 1 million
Is there a bonus level or is the star level the bonus level?