|I just used the walkthrough to find the last secret stage I was missing, and a few other hidden exits that just open up shortcuts... now I have all red stars, and I beat the game again...|
but wait, the extra stages are unlocked from a patch, not from clearing the game with all red stars... well then.
I beat the first 6 out of 9 extra stages. They're really fun... I was expecting kaizo bullshit, but most of the difficulty is just in figuring out what to do. I did need the help of a guide for most of the extra stages though, but extra 6 was a really crazy yukkuri rolling stage and it was fun enough that I figured that one out on my own.